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I have a situation that is perplexing me and I’m out of potential causes. This past year I replaced both of my Mercruiser 7.4L long blocks with new factory GM units. They are MEFI 2 models and the motors run great at idle and at cruise speed. The issue I am having is with the port motor idling...

This past winter I replaced both motors in my 97 Sundancer. They are new GM 7.4L MPI’s attached to Hurth ZF transmissions. I’m experiencing a nagging issue on the starboard motor where after warming up it tends to idle rough, causing the transmission to rattle in gear. If I shut it down and...