I have a 1991 Trans Am 305 with 5 spd. No mods. 68,000 miles. Good compression.

The car surges from 1000 to 600 rpm for several times then runs smooth. Then 30 sec. later it surges a few times and then smooths out again.

If I rev the engine to 1200 RPM it runs rough and has the same surge feel that it cycles through consistently.

I brought it to my mechanic after the car would keep killing as I went to neutral while driving.

He changed some items: EGR valve, module, oxygen sensor,and IAC. He checked the TPS and coil pack and they were OK.

Now the car does not kill anymore, but the surging is still there.

I ran some fuel cleaner through it, but no change.

I've brought it back to him, but he says these cars just tend to run this way and that he can't find anything wrong.

Is this something I have to live with. Sometimes it is so rough and surging that I get a stomache ach!

Any experience with this problem, please contact me.



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Sean

1977 S/E TA
1980 Conv. Turbo TA
1989 TTA
1991 Conv. TA

 

I had the SAME problem on my 89 350 TPI ended up being the injectors and I had 65,000 miles on them. 3 months later my friends iroc with 61,000 miles had a bad surging problem sure enough all 8 injectors were bad.