Originally Posted by TRENDZ
Originally Posted by tabletop390
We just ran into something similar on a buddy’s car and the fix believe it or not was a new master switch. The initial hit and vibration off the line and during the burnout was causing the disconnects and reconnects and making his MSD go nuts. Once he got out around 30-40 ft car settled and didn’t vibrate as much and ran like a champ. We did everything, converters, carbs, rebuilt the trans, etc.


Don’t discount this. It has happened to me also. My car was EFI. The logger was the EFI. When this happened, it would get a corrupt the log, so finding the issue was difficult. The engine wouldn’t die, nothing went 100% dead, but everything electrical would glitch. Would not believe it if it hadn’t happened to me.


I had a friend with a backfire problem on a nitrous mustang. It would backfire at the hit no matter what we did. The problem ended up being a bad connection at the master switch. We found the problem real quick at the first night race because the taillights flashed, then it backfired and moved out. We fixed the connection and he promptly dang near drug the bumper off of it on the next pass when everything worked as it should.

68 Barracuda Formula S 340