My question doesn't relate to chevelles, but I own a '70 SS 396. My question relates to an '88 Grand Am quad 4 engine. I am in college and I don't have a lot of money, so I have been doing many fixes on this car myself. I have an ignition problem that I don't know what angle to hit it from. When the car warms up (about 15 minutes of driving or more) it will start missing and backfiring and finally it will die out. Then I will have to let it cool down and it will start again and drive with no problem until it gets warm. I have checked the entire fuel system and the injectors, as well as the O2 sensor. The engine only has 30K on it, but the ignition has 130K. I have replaced the plastic coil housing (similar to distributor cap) and I just replaced the wiring harness that connects the two coils. I ohmed the coils and they are the same and at standards. What is going on? The car runs fine and doesn't miss until it warms up. Is it a problem with the coils or the ignition module??? Some of you guys work in shops and might have some good advice for me on how to test the coils or modules. Thanks, Hugh.