Hey guys,

I have a problem. Notes on the car:

1994 Camaro Z28
-150,000 miles
-Auto transmission
-Opti, coil, plugs, and wires replaced 20,000 miles ago
-New fuel pump/filter
-New O2 sensors
-No SES light

My problem is that the car has a bad hesitation/stumble throughout the RPM band. The car also vibrates badly has the RPM's go higher.

At first the problem only showed up at half to wide open throttle, now a month later it occurs at any throttle range and even has a rough idle to boot now. No smoke coming from exhaust, looks clean.

I cannot for the life of me figure it out, I do not want to take this to the (st)ealer $$$ but I will if I have to. I was wondering what input you guys could give me as to solving this problem myself before it comes to that.

Thanks for any advice you could give.

 

Sounds like an ignition problem but that's not a certainty. First thing to do is to check the wires...sometimes they rub and get worn through.

 

Thanks Bw Hunter. I had already looked at the plug wires but after reading your post, I decided to double-check them again more thoroughly and found the problem. Plug wire #8 was burned through just a little bit from the exhaust manifold just enough to cause the problem. Replaced the wire and problem solved.

Thank you.

 

I replaced my plug wires because I burnt the #6 wire because of the header, so I replaced them with some 8.5mm wires, and man they are a pain to route through the factory location on the pass side of the block. I had a problem with the wires trying to slip back off @ the opti. and of course it led to the same problem within a couple of days of the wire change

 

My pleasure....