I have a 95 Camero 350 Gen II LT1 engine installed in my 55 Chevy. It starts & runs well when cold, but when @ operating temperature, it will die in gear. Dropping it in gear with a small increase of RPM usually gets the car moving, but usually after some coughing, backfiring or hesitation. My pre OBD2 ECM is from http://www.psiconversion.com/ Occasionally, the MIL light comes on, but goes off soon after the car is moving OK. I bought the engine used, & I think it may have a performance Cam in it, as it has a somewhat lumpy idle. Could the performance Cam be the cause of this problem or something else? Help!