Ethanol and Rough Idle ???

[Huskybass]

I recently boaught a 19' Javelin with a 150 HP Johnson Faststrike from a friend. We took the boat out together for a test drive and the motor ran great. It continued to run great until I purchased gas in Maine that had ethanol in it. Now it still runs great once up on plane, but it sputters and coughs while idling. I put a can of seafoam in the gas tank and it seemed to help some, but I would like to have it idle even smoother.

I'm sure some of you have run into this before. Any advice would be greatly appreciated. Thanks in advance.

[svfetter]

Could it be time for some new plugs. Also, the ethanol could have messed up the check valves in the fuel recirculation system. I believe that engine still has that type of system. Someone will correct me if I am wrong. Good Luck.