1994 backfiring

chiefkenny

New member
Hey guys,
I have a problem with backfiring since I put a new battery in . The old battery could have been dead for for a month or two. It has an msd d6 with 7000 rev limiter a diablow tuner chip. I don't know if not having power messed up the tune? I thought maybe a loose connection but can't fine one. It ran great when I parked it in the garage. It randomly backfires out the exhaust. It may clear up and run fine after it warms up. Then first thing in the morning I start it up and backfires again......
 
I would take the msd out of the equation first by removing it and see if that fixes it. You didnt' hook the battery up backwards did you, even momentarily because that could kill the EEC and chip.
 
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