Purchased 1982 150HP Johnson (Model J150TLC) which came off of a deck (pontoon-type)boat and installed on a 19-foot V Hull Al Center Console (1986 Sea Nymph CC-191) (V-hull approx 1800 lbs.) which I restored. Motor started fine and ran OK with muffs in driveway. Idled at 2500 rpm and could...