I am not clear where you live but great lakes boat top may have your boat on file. Sea Ray uses them almost exclusively. It comes quickly via FEDX or UPS.
If you decide to upgrade as I did this last year on my 2004 260 Sundancer you may have to remove the wood slides/feet and cut them down about 1/2 inch so the newer model will slide all the way back. Norcold no longer makes that model. My new refrig i...
Have you thought about replacing the IAC ( Idle Air Control Valve) I see it is easy to do and it may casue issues like this. Videos online seem to indicate it is easy to do. (DIY)