my car is sputtering on acceleration 95 lt-1 z28 at idle it feels ok,kinda, there is a problem but it is very faint, but under load it sputters and just doesnt accelerate normally,when coming to a stop the car seems as if its learching ie: wants to push the car then it doenst then learches,it is real wierd, my brother was behind me and he said it smelled of un burned hydrocarbons?? i am thinking maybe clogged catalytic converter?? maybe i'm all wet and dont know nothin. Any help is appreciated. 95 z 28 Lt1 and if its the cat,what is the original diameter of the exhaust?

 

I would start with the basics, plugs, plug wires, vaccum lines, make sure all your sensors are pluged in etc. Is it the original fuel pump etc?

 

Common culprits- plugs, wires, optispark.

I had a problem with sputtering that turned out to be my opti. At first it would only sputter at low RPM under load. Then it began to sputter at less and less of a load until I had a misfire at all times. The #7 cylinder was not getting spark.

Disclaimer: I think the opti gets blamed for way too many things on this board, that's why I'd suggest changing the plugs/wires first.

 

Like above - most likely plugs/wires/opti. I would go after plugs and wires first - i agree with FastZ the opti gets a pretty bad name around here and too many peopel end up replacing it when it's NOT the problem. The last thing you want to do is spend $250 on a new opti and 4-6 hours replacing it (if it's your first time) and have that NOT be the problem.

 

This is a duplicate post. Be considerate of others and delete one of them.

http://web.camaross.com/forums/showthread.php?t=339657