I finaly got the car running. The problem is at about 2000rpm I have surging. The car will rev fine if I hit the throttle to the flore but if I rev the car slowly it hits about 2000rpm and the tach bounces up and down a few hundred rpm. I think I found a vacume leak but I didn't have time to tear into it last night. Any help or ideas and I will be greatly thankfull. Thanks


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1991 Trans Am GTA, Accel 300+ ignition, underdrive pulleys, AFPR, Accel SuperRam (ported out), Edelbrock lower intake (ported out), BBK 58mm TB, TFS 23* heads, SLP 1 3/4 headers, SLP 3" cat back (no cat), CompCam .495/.502 lift, Kenny Bell strut tower brace, lower frame brace, Jeg's SFC, Lakewood trailing arms and panhard rod

Pony's can run, but bird can fly

1987 Buick Turbo-T
1977 Chevy Blazer 4X4

 

I had that problem once. It was a faulty PROM. You might want to unplug the throttle position sensor and slowly run it through the rpms where you were having problems. If it runs clean then it is a bad TPS.

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• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo

 

Thanks I'll give it a try tonight.

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1991 Trans Am GTA, Accel 300+ ignition, underdrive pulleys, AFPR, Accel SuperRam (ported out), Edelbrock lower intake (ported out), BBK 58mm TB, TFS 23* heads, SLP 1 3/4 headers, SLP 3" cat back (no cat), CompCam .495/.502 lift, Kenny Bell strut tower brace, lower frame brace, Jeg's SFC, Lakewood trailing arms and panhard rod

Pony's can run, but bird can fly

1987 Buick Turbo-T
1977 Chevy Blazer 4X4

 

I dug into the motor yesterday and found that big vacum leak but the car still surges real bad at 2000rpm's. The car run o.k. but needs the idle adjusted (I'll do that tonight) and if you step into the gas it has a slight hesitation then it runs like a bat outta helll. Can anyone think of anything. Thanks

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1991 Trans Am GTA, Accel 300+ ignition, underdrive pulleys, AFPR, Accel SuperRam (ported out), Edelbrock lower intake (ported out), BBK 58mm TB, TFS 23* heads, SLP 1 3/4 headers, SLP 3" cat back (no cat), CompCam .495/.502 lift, Kenny Bell strut tower brace, lower frame brace, Jeg's SFC, Lakewood trailing arms and panhard rod

Pony's can run, but bird can fly

1987 Buick Turbo-T
1977 Chevy Blazer 4X4

 

How about a custom PROM ?!

 

I aready have a custom prom. I guess I should that in my sig.