i have a 78 mercruiser 120 it runs smooth at half throttle for a long time then after a few min of wot then power down in a no wake zone it wont idle and is hard starting until i rev it up till it clears ( around 4000-5000 rpm) then it runs fun till next time i take it to wot ive rebuilt carb, points new and ajusted, wires,plugs,cap, coil and all the filters, the mixture screws have been set ive spent alot of time on this engine not sure where to go from here
