This is a follow up on my problem with my Mercruiser 5.7EFI throttle body fuel injection engine. The alarm has been going off only 1 time after a few minutes run. When I turned off the engine or put it in neutral and ran it again no problem, We disconnected all 3 alarms, one at a time and it still went on low RPM mode without alarm after the third alarm sensor was disconnected. The service guy is confused and changed out the spark plugs and looking of anything else that might cause the reduced RPM mode. Could a back fine send off the alarm for some reason?