My car is a 1989 Iroc-z 350 TPI - stock

Since i bought the car it has had a growing surging problem at idle, it has seem to have gotten worse..it now surges at almost every stoplight and dies unless i keep the rpms up

Things i have tried-

Recent Tune-Up
New TPS sensor
New IAC valve
Fuel pressure is fine, holds
There are no vacuum leaks
New Fuel Filter

I have run out of ideas, the person i bought the car from said the injection system had been gone through, but i am thinking maybe it's the injectors? I did check the ohm resistance, it ranges from 10.3 to 16.6

Should i buy new injectors? any help is appreciated..
thanks in advance

 

try the egr valve.

 

Yep, EGR would be my first try. Just unplug the vacuum line and plug it up, get a service engine light but should run ok and you'll know where to start. Might be a timing problem in the ESC but you should be getting a light from that.

 

I finally found some time to check the EGR valve, it seems to be working just fine. Thanks for the suggestion. While i was trying to diagnose it i found that when i pull the power to an injector it smoothed out the idle? I'm not exactly sure what this means so if someone could be of a little help to me i'd appreciate it. It doesn't make a difference which injector i disconnect they all seem to have the same effect.

Oh yeah, I also tried some of the Chevron fuel injector cleaner that you just dump in the tank.. don't think it changed anything.

Thanks for the help

 

I forgot to mention when i mash the throttle it sputters for a second hopefully i can solve this problem soon