merc. 70hp problems

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Posted by c ferguson ( on June 01, 2005 at 06:20:21:

My 1986 merc 70hp outbourd started acting up on me the other day on the water. Right after I switched tanks it fowled the top and middle plugs and wouldn't idle. I limped it back to the dock and pulled it out of the water. I let the motor down and a lot of bubbley gray/black sludge started comming out of the exhaust ports. I checked the H2O pump and the lower unit gear oil it was fine. Where do I go next????

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