1999 very low hours oil injected 90 HP Mercury. Idles very rough and smokes, however when you give it more throttle it seems to run smooth and stops smoking.I have changed plugs and the fuel filter - no change.
I have a 1999 Mercury 90 Big Foot that only has about 40 hours on it. However when i'm at a slow speed or in idle it runs real rough and smokes. When i'm at a cruising speed it runs smooth.
