Mercruiser 5.7 Mag MPI quits if it idles too long

[Mark72233]

And to add to your theory I was running the generator today along with A/C and water heater since I haven’t run them all week. The generator would certainly add to the heat in the bilge/engine area. I run the blower the entire time as recommended but running slow speed would also not push a lot of air through the side air vents as well.