Almost there.. need some advice (Page 2/2) Raydar OCT 06, 08:31 AM Your car is an 86? Any 86-87-88 Fiero V6 ECM will work. Your PROM should be okay. You can use an 85 V6 ECM as well, but it will have to have the correct 85 PROM for your trans type. You 86 PROM will not work. buddycraigg OCT 08, 08:46 PM I know you have a engine swap. so that might be a problem. Check all of your fuses. On a stock car, having some fuses blown will make things "back flow" current (if that is even a word) and do strange things.