Mercruiser 4.3 backfires in rough water

[Valiant]

Seems to run fine in smooth water, but when its start bouncing, it sputters and backfires.<br /><br />I attributed it to old gas the first time, but I have gone through several tanks of fresh this season. Only in rough water. When its smooth I can run WOT with no problems.<br /><br />Suggestions from the learned?

 

[JB]

Re: Mercruiser 4.3 backfires in rough water

First suggestion: Post your question in the correct forum.<br /><br />This is for mercury outboards. I will move it to I/O and Inboard