SYMTOMS: Idle fluctuates from 900 to 1500 engine running rich and engine lights comes on. I would try to drive the car but the car would hesitate. I tried to scan for codes when it comes on with no success. turned of the engine for 10 minutes and the car would run normal and scanner would show Pass. This happens once in while. New maf, ect, iat,mpls, tps. I do have the first generation chip ,shift kit ,cone filter installed. What could be the problem?