2G I really need help figuring this out

[Kenny07]

Ok, recently had the engine rebuilt. Got it back and car drove fine for about 20 minutes. Turned it off for a little bit and started it up now I'm getting this...

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At first I got a CEL p0300, I replaced the TPS, and Sparkpugs. I've cleaned the throttle body, and replaced the vaccum hoses for the EGR system. I checked for vacuum leaks but couldn't find any. I no longer have any CEL but the car is still doing the same thing..
-RPMS go from 1000 to 250, car almost stalls but doesn't
-Smell of fuel in exhaust and engine bay
-Fuel rail sparking very loudly (see video)
-exhaust bogging (see video)

What's weird is when I rev past 1500 the car sounds fine, but when I let go of the gas it drops to 250 and almost stalls
Any help is greatly appreciated
Thanks for looking.

Also don't mind the mess, I'm in the middle of painting it

 

[inthemidst]

Your BISS screw looks completely closed. Open it up a little bit (unscrew it) also check your idle air control motor.

 

[PlanZero]

If anything, I would suggest screwing the BISS to increase RPMs a bit. Definitely check the IAC, and make sure the TPS was properly adjusted. Also check MAF.

 

[2gmitsueclipse]

Things to check:

• Battery connections and grounds are connected/clean

• BLT

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• Verify mechanical timing http://vfaq.com/mods/timingbelt-2G.html

• Check TPS: http://www.dsmtuners.com/threads/questions-about-the-tps.401856/

• Check IAC:

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[Kenny07]

thanks guys. I found a leaking injector so I'm going to go ahead and replace those hopefully that will take care of the problem. Just wondering, would a leaky injector throw a cel?

 

[bduran1220]

Misfiring

 

[Kenny07]

So I replaced the injector o rings and I still have the same problem. Any ideas?

 

[2gmitsueclipse]

Which o-rings did you replace? The upper o-rings or lower? The lower ones are typically the culprit. Did you get the correct kit for the fuel injectors you have?

 

[Kenny07]

I replaced the upper O rings Felpro ES70600 I picked up from O'reillys. I have stock injectors
Are my lower injector insulators supposed to be hard or rubbery?
Also, now there's a CEL. I'm going to pick up a code reader and see what it is. I'm absolutely stumped its misfiring and can't hold RPMs even when I take off the idle sensor and adjust the Bisss the idle still jumps

 

[2gmitsueclipse]

Extremepsi has a decent kit that includes the upper and lower o-rings. I would recommend replacing both. Get the ones for OE injectors.
http://www.extremepsi.com/store/product.php?productid=17787&cat=863&page=1

 

[Mauispyder]

Did you verify mechanical timing yet. Engines can jump a tooth when turned off if everything wasn't tensioned to spec

 

[StevetotheH]

I'd vote for timing, one tooth off.

 

[Kenny07]

Yes I checked for timing, everything is lined and in time. Like I said, the car runs perfectly above 2000 rpms

 

[StevetotheH]

Failing CAS.

Bad IAC, stuck open.

Bad PCV, at higher rpm this has less influence than at idle

Sounds simple, but make sure you don't have a loose plug.

Your mechanical timing is good, what about your electronic timing? CAS Adjustment.

 

[2gmitsueclipse]

I wonder if the OP checked everything in post 4?

 

[Kenny07]

Failing CAS.

Bad IAC, stuck open.

Bad PCV, at higher rpm this has less influence than at idle

Sounds simple, but make sure you don't have a loose plug.

Your mechanical timing is good, what about your electronic timing? CAS Adjustment.

Thanks, I put a new IAC in and I still have the same problem. I'll get a new CAS and try that. And I'll check on the electrical timing.

 

[Kenny07]

I wonder if the OP checked everything in post 4?

Yes I checked everything but the TPS and the next chance I get I will do that. I found a leaking injector and fixed that first.
And thank you for the link.

Would a bad TPS cause misfires though?

 

[StevetotheH]

Would a bad TPS cause misfires though?

Bad TPS usually causes rough idle and will make the car fall on its face when you punch it. As I recall they don't generally cause misfires. Easy to test with a multimeter though to eliminate a posibility.

 

[Kenny07]

Bad TPS usually causes rough idle and will make the car fall on its face when you punch it. As I recall they don't generally cause misfires. Easy to test with a multimeter though to eliminate a posibility.

I'll do that thanks

 

[DSMattitude]

A leaky injector could very well cause a misfire, but to be sure which hole is the culprit, start it and pull the plug wire off #1. If it runs worse or dies, move on to 2 and so forth untill it does not change when you remove a wire. Once you find it check everything to do with that cylinder. Check the plug for tightness, gap, make sure the plug wire is firmly on botht the plug AND the coil, check injector connector and the wire leading to it. An easy way to check for a vacuum leak is to spritz down mating surfaces, vacuum hoses, couplers ect with carb cleaner while it is running. If it smooths out when you spray your intake runners it could be a gasket or a bad injector cushion. Other than what everyone else has said, thats all i got.

 

[Kenny07]

A leaky injector could very well cause a misfire, but to be sure which hole is the culprit, start it and pull the plug wire off #1. If it runs worse or dies, move on to 2 and so forth untill it does not change when you remove a wire. Once you find it check everything to do with that cylinder. Check the plug for tightness, gap, make sure the plug wire is firmly on botht the plug AND the coil, check injector connector and the wire leading to it. An easy way to check for a vacuum leak is to spritz down mating surfaces, vacuum hoses, couplers ect with carb cleaner while it is running. If it smooths out when you spray your intake runners it could be a gasket or a bad injector cushion. Other than what everyone else has said, thats all i got.

Thanks man. I'll try that