Friend has above boat. Last couple times out noticed exhaust smelled a little gassy. Boat started a little hard a couple times. This am, boat didn't start once. Let it sit for a while then it started. Idles ok. Backfires if you give it full throttle and sounds like its missing too. Seems to run ok at wakeboard speed. He changed plugs this spring. Wondering where to start checking. Bad gas? Distributor cap? Plug wires? Wrong plug gap? Just trying to get some ideas. Thanks
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