150hp starts missing bad at 3000rpm

[terryb9073]

was going across lake @ 4500 and just started missing bad runs perfectly till it hits 3000 or more.starts fine,idles runs great 3000 or below good comp. and spark...what do i check? help................

 

[pnwboat]

Re: 150hp starts missing bad at 3000rpm

Could be spark or maybe fuel flow. Check your plugs, plug wires, ground wires that go from the ignition coil plate to the block. Try squeezing the primer bulb to push more fuel into the carbs when it's missing. See if that has any affect.

 

[jerryjerry05]

Re: 150hp starts missing bad at 3000rpm

Water in the fuel.Dirty filters.Ethanol damaged hoses.Dirty carbs.Fuel pump diaphram bad.J