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Engine runs rough at idle intermittently,sometimes idles perfect. Same at full throttle but will be running great then just falls on its face, like bogging down with low fuel in carbs or maybe losing fire. Has new fuel pump and I have replaced fuel lines and primer bulb. Fuel filter is clean. Oil injection has been disconnected(mixing oil in fuel tank). Also top end of engine rebuilt before I bought boat. These problems occur when cold or warmed up state. Any troubleshooting idea's? Or how 'bout a cure. Thanks for your help.

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Pump the fuel bulb when this happens and if that doesn't help you may have a power pack going bad. You can put a timing light on the plug wires and see if you are getting spark to all cylinders when this happens. Intermittent problems like this are always the hardest to solve.

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