I have same engine with 500 hours. Since 0 hours, I just glow for 7 seconds (its warmer here) and crank with no throttle at all. Recently it behaved exactly as you say, and pissed me for 2-3 months. As part of my regular maintenance I went down and drained the water/fuel separator, and found amazingly 1/2 glass of water (note: this separator is the cheap black one, so I can't see through the bowl). To my surprise, engine went back to the original firing behave just after some cranks on that day. I can't correlate, but I'm glad its back to the normal ....
Beneteau Oceanis 43
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