I have a 1990 VIP fiberglass 179 fish and ski fitted with a 1990 Johnson GT 150. Enigine height looks correct. Prop is 14 1/4 x 21, aluminium. Plugs all look good. Throttle position is ok. I can only turn up to about 4300 RPM WOT even lightly loaded with little fuel. I can trim up until prop...
