I have a 94 trans am. When I get into high rpms my car stumbles and falls on its face. I changed the plugs, fuel filter, and fluched the injectors with one of those 3m kits. I am thinking that it is either the plug wires, coil or....................the opti . The wierd ting about it is the longer I have the car on (the hottoer it gets) the lower on the stumble occurs. i.e. if I have had the car on for 5 min it stubles @ 5600 if it has been on for 25 min. it will stumble @ 5200. Anybody else had anything like this happen to them. Responses would be greatly appreciated.

 

My car does the same thing. Go get yourself a new coil and wire. Get one for me too while your at it!

 

How do you know that it is the coil and wire, can it be tested with a voltage meter? By the by how much do these things cost?

 

I just replaced my coil because of the same problem. Seems to be working so far

 

My problem was in the plugs + wires when I had the same exact problem, it would be between 4k -5.2k consistantly ( mine were stock with about 100k on it) . Sometimes it didn't sometimes it did. Finally found out two wires were arching to the block on heavy load. Just replace the coil and wires , at least the wires. You should take care of the problem right there. Hope that helps.

 

did you ever fix the problem? I have had this same exact problem for a very long time.

 

sounds like opti to me

 

Thanks but already replaced it. Same with coil, module, wires, plugs, injectors, fuel pump, MAF, ecu, kitchen sink.