Motor Help

[N.E.T.O.]

I have a '88 Merc 20 that had the same symptoms. Idled fine (as fine as they idle anyway, which in my opinion sucks) and would rev up in gear in the driveway, but not under load...my coil grounds were loose and/or corrode. I loosened them up, and retightened tight...end of problem! Its amazing one both cylinders will do for your top end speed!
Hope this helps.
Randy
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