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Late 70bs merc 50 # 3 cylinder dead

"Is this the model with 4 coil

"Is this the model with 4 coils? If so, swap the coils and see if the problem follows. If it has a distributor, yank on THAT cylinder's wire and see if it comes out of the cap. I had an old Mark 35A do that to me--it ran great until the distributor moved, then lost #3 cylinder. Idle back down, the ~(@^$ wire went back into the cap and she ran on 4 again. Drove me nuts!

Jeff"
 
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