have a 94 GC8 2.0 turbo, modded.

Problem:
-semi-rough idling at start up
-car hesitates a lot on cold start, usually have to wait for a few min for the car to warm up before i can drive. even after it's semi-warm, car still hesitate (almost as if it's hitting fuel cut between 2-4k rpm, tried it in 2nd,3rd,4th gear) and if i was to smash around for a little bit to really warm the car up, problem goes away.
-engine bogging? i would let it engine brake in 3rd gear, but as soon as it gets to 3k rpm, it would sound kind of rough goin down in rpm, not very bad sputtering but i can hear/feel it. and in second gear it would happen in about 4.5k rpm going down.

does this sound normal? what gets me is the engine braking being a bit rough...

any help or advice or suggestion would be greatly appreciate it.

i've already changed out my pcv, fuel filter, spark plugs. im gona try and clean my IVAC..

 

Coil pack and leads?

 

as far as coil pack go. what is a good way for me to test and see if they are good or not? thank you for the fast reply

 

My bet would be electruical too. I had a similar problem once after a service, when a ham-fisted techy had damaged a plug lead.
Took them an age to find the problem.

 

I had very similar problem that you were having.

If you look very closely at the coil pack when the engine is running you could see a small jumping spark.

The problem turned out to be a failure in the leads and coil pack. As a result it had cracked several of the spark plugs.

 

hey thank you for the reply. when u said look at the coil pack, do u mean where the electrical connector connects? mine is converted to 02 coil pack. feeds from side engine. is yours the same too?

 

Should look like this

 

mine look like this....



coil pack conversion