Finally after weeks of dealing with this super annoying code 15, i went to the dealer today and bought a new wiring harness for the cts. I had tried just about everything else and even contemplated selling the car, but now that this is seemingly fixed, im grateful for everyone who helped. If i remember right there were a few other people on this board who had the same problem i was having. If you never got it fixed, replace the wiring harness and see if that does it. It's only 20 bucks and like me it fixed the problem. Ive just got one last question, how do you know if a choke is adjusted correctly?

------------------
1987 LG4 Camaro z28
Modifications- Flowmaster 80 series, KN airfilter, high flow cat, 180* stat, edelbrock performer intake manifold, msd blaster coil, ascd big block hood, panasonic cd player, rockford everything else.