I have an 84 ttype I had took out the stock ECM and plugged in the 87 ECM as well as the Maf.(no chip) check engine like flickered car stalled. So clearly that didn't work. Took out the 87 ECM went back to the stock ECM/maf and ever since the car has been running rich. Not only that it will only stay on for 20 seconds before it stalls out. Normally I would have to turn the key but press the gas at the same time for it to start. I would have to keep my foot on the gas for at least 3 mins so the vehicle can start to idle at the correct rate without stalling out. Since running rich I have changed out the plugs because they were fouled out. What else should I be looking at? If I can I will try to post w picture later because I think the vacuum lines are all out of whack.