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  1. M

    Engine runs rough after 3500 rpm

    1991 boat 1992 motor 4.3l dbl barrel carb. Thonderbolt IV Ignition. Swaped short block only(same intake etc except whats new). Engine runs great at Idle,on takeoffand planes out. Like clockwork the engine goes to missing kind of a backfire sound at 3400 RPM's. It cleans up alot but not...
  2. M

    Mercruiser 4.3l 1991 timing,&mid throtle backfire

    Hello! I have a 1991 bayliner. I put a 1992 chev. truck motor in to get me through the summer while I rebuild the mercruiser. The trouble I am having is the engine runs and idles great. Takeoff has excelent performance, top end is perfect but when I back down to mid throttle it goes to...
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