Ok this is in a 1994 GSR...... on cold starts, the car idles fine. When warm, it will die anytime its not in gear. I changed the whole throttle body with TPS sensor, changed the coolant temp switch and checked the plug. I changed the IACV. Im thinking the head is cracked. The previous owner had CTR pistons which detonated like crazy.. any idea?? oh yeah.. even on the freeway, if it put it in neutral, it will die.