runs bad after warm?

[Firechicken90]

Hey there guys I'm a newbie on here. I have a 90GST stock that started shuddering on light throttle or slight load, like it has a large vaccum leak or something and smokes black. I recently removed all the emissions...evap,charcoal canister,EGR ect. after reading a post on it and not being able to find a leak FYI(boost leak tested it). I also have replaced the plugs gapped(.28) and wires which changed nothing,since it was rich I thought maybe the converter was on the plugged side so it is no more, also I swapped my BOV to an EVO8 still with no change. After getting pissed and leaving it parked I went to move it the other day and noticed it was running great went about 1mi. down the road and ended up going back to crap, whenever the car is cold it runs great but after a couple mins. of driving it falls on its face a won't accelerate hardly at all? Does anyone have any ideas, or the next thing I need to check into.

Thanks,
Adam

 

[SpawnedX]

Anytime a car runs smooth cold, but then becomes poor performance at temperature, it usually indicates you may have carbon build-up, possibly from burnt valves, carbon deposits hold in heat, and black smoke is an indicator of unburnt fuel.

I would recommend you take you VC off and exam your valves, look for a charcoal like substance building up on the neck.

Let us know what you find.

 

[Firechicken90]

Thanks I will do that tonight, but I really think it is a sensor or something. Yesterday it ran fine for about 5-6mi. before it started acting up again. When it is running bad it won't run over 1/4 throttle anything more and it bucks and jerks along with the black smoke, almost like an MAF gone bad on a GM ? I appreciate any further suggestions or ideas thanks guys!

Adam

 

[Firechicken90]

SpawnedX
"I would recommend you take you VC off and exam your valves, look for a charcoal like substance building up on the neck."

I pulled the exhaust manifold off last night to check the valves and inspected the PVC, oil fill, throttle body and what I could see in the Intake for signs of carbon and didn't see anything out of the ordinary "also when I removed the EGR the other day it too was carbon free"?

I am looking for any ideas, honestly I believe this problems to be senor related but not for sure?

I appreciate any help or ideas anyone might have!
Thanks,
Adam

 

[SpawnedX]

Are you throwing a check engine light at all?

 

[Firechicken90]

I have no codes? My laptop crashed so no way to look at Data either not sure what senors are doing what? Any ideas?

Thanks,