Joew2604
Veteran Member
Just put in a rebuilt 350 mercruiser. New distributor and plugs/wires. Starts and idles beautifully. Runs smooth up to 2500 rpm and then it backfires. Rechecked the timing, OK, adjusted the distributor while running, but still backfires. Filled up with new fuel, still backfires. The carburetor was rebuilt, Still backfires. Anyone have any ideas or suggestions? What am I missing? Appreciate any input. The boat has twin 350's The port one runs fine. Thanks. Good and safe cruising.