06-11-2017 06:24 AM
First time boat owner and I am hoping someone out there can help! We bought a 2001 31 ft. Sundancer with 5.7 350's, the port engine had just been rebuilt, it had a little over 200 hours on it when it was rebuilt. During the survey and subsequent sea trials the port engine stalled a few times when throttled down to an idle. We hired a Merc Certified Mechanic and have since replaced the IAC, had the ECM re-flashed, installed a new MAP sensor and it is still stalling. The engine starts right up and idles great after sitting overnight; rev it up a little {2000 rpm's} and throttle it down to an idle; it spits, spurts and sputters then stalls. I've put 25 gals of fresh fuel in along with couple Merc fuel additives. Hoping someone has some ideas on what might be causing the problem. Thank you.
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