ok, Ive got a 94 z28 and this is my first lt1 car... just recently i started my car up and the ses light turned on about 3 secs after the car is running... but it runs fine... after about 1hr to about 1 1/2 hrs the car will run very rough (down atleast 1 or 2 cyl.) but driveable... you know its down a couple cylinders mainly because of power loss, and a lot of unburnt fuel coming out the rear!!! I changed the ignition control module because that was one of the things that I was told that can act up if it gets hot... I was also told opti. It has been raining on and off around here quite a bit, would moisture do the same thing to my car repetatively in the cap and rotor!!! I dont know, HELP