There is a wealth of info. always posted from some people well versed in engine mechanics and troubleshooting.....and I'm not one of them. With that being said, I had a similar problem many years back with a 327 in my 31' Commander. The engines always started and ran well until about a half hr. into the cruise(app. 2900RPM).Then the starboard motor would sputter and quit and not re-start and I'd limp back to the dock on the port motor.I made a list to replace of all the usual things that one would suspect could cause the problem.Halfway through the list, the problem kept rearing its ugly head,except once when it occured at dusk.I didn't know it at the time, but some of the cabin lights that were on had gone out.Again, we limped back to the dock with one motor,which took about an hour.Just as we tied up for the night,my wife said "the cabin lights just went back on".Hmmm. The next day, I pulled out the wiring diagram and to make a long story short, I cleaned and re-tightened all the connections to the terminal block located on the rear of the engine and I never had that problem again in the eight years that I owned the boat.For what it's worth, sometime the problem is real simple. Good luck and best regards,
Steve
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