My brother contacted a Mercury mechanic in Kentucky and he said it could have an exhaust leak causing it to do just that. I think you may be on to something. Thank you.
Thank you for your reply. Not at this time. It is on a Tracker DLX22 and in the water. Maybe I can call Bass Pro and get it. They were the last to service it.
I have an issue that is driving me nuts. My 2017 115 Merc outboard 115 HP 4 stroke will not idle for more than 30 seconds. It runs great otherwise. Here is the clincher. I can remove the cover and it will idle perfectly for as long as I wish it to. Remove the cover and idles perfect. Put it back...