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    502 MPI/EFI wont reach rated RPM and now has a surge at idle and slow throttle

    i got this boat at the end of last season and the engine a 502 mag would only get to 1400 rpm and has slow throttle. Over the winter I changed the cap and rotor,plugs,filters, and cleaned out the fuel vapour tank, I also bench tested the pump and it had 35 psi. I put the boat out yesterday and...
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