I've been having a problem with my '98 3.8 Camaro, it stumbles a lot when it's warm out, or rainy. In cold weather it runs like a dream. Whenever it has this problem, the tach is also going crazy. The only code it has thrown is:
P0341 Camshaft Position Sensor Circuit Range/Performance
And it has only thrown that 1 time, even though it's ran really rough plenty of times. I swapped the sensor, no change. I checked the wiring to the sensor as best as I could, didn't see anything wrong. I did read that electrical interference could cause this code, is there a chance that since this harness runs up to the ICM that it's picking up interference form the spark plug wires? They're really close to each other.

 

geuss it is a possibility, but I would think that we would have heard about this problem from more other people.. (never happend to mine and I had a 97 & 95 both upto about 150K, anybody else have the problem??).. anyways couldn't hurt to try rerouting or better insulating the wires but perosanlly I would think the problem is caused by something else (kind of sounds like it may have something to do with the air/fuel mix??)..

 

You may want to check the "misfire mystery" sticky at the beginning of the V6 topic. I have the exact same problem, only I get in when the temp gets up. Especially with fall being over, and summer starting. Louisiana only has two seasons a year, summer and fall, and fall only lasts for about one week in December .