Question for Riviera owners past and present...
We are gearing up for vacation on our newly repaired Riviera. It is an '83 with a single screw 454 crusader.
The problem is, most of the time when under way, we get high carbon monoxide readings in the aft cabin. We are trying to figure out how to remedy the issue, i.e. opening or closing different windows to try and get air flow through there to consistently get fresh air in there.
Has anybody had similar issues and been able to come up with a good solution?
Thank you in advance.

One more thing to throw out there... I still have issues with the engine at idle, usually after cruising, then coming down in speed to idle speed with the engine stalling. Think it's to do with the carb...I have limited carburetor experience. Was wondering if someone could lend advice on tuning the carb. Its a 4 barrel rochester carb.
Again, thank you and best.

Pete