Car problem help :(

[Kavinsky]

Maybe the choke is set too high or the cars Air to fuel mixture is too lean (too much fuel and too little air) and is causing the backfires.

Which was the same thing happening with Leno's Mercedes 300 SL Gullwing when they put it on the Dyno.

http://www.jaylenosgarage.com/extras...ays-dyno-room/

http://www.jaylenosgarage.com/segmen...ullwing-coupe/

Mind you I don't think your car has a lamb skin diaphragm.