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    '87 Merc 5.7 revs rhythmically between 1000-1800 rpm

    With the throttle just above fast idle to about 1800, the engine revs rhythically up and down about 1 to 200 rpms. It doesn't do it at idle or at plane. Weird. Any ideas? Have changed the sperating fuel filter, had recent tune up. Runs fine to top end.
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    Merc 260 I/O overheat

    1986 Mercruiser 260 Alpha 1 Chevy 5.7l is overheating. Have replaced: -Impeller and outdrive pump assembly (twice) -thermostat -thermostat housing -all out drive boots -engine circulating pump have back flushed out all hoses, inc the power sterring fluid cooler. Runs at about 145? at 1500rpm...
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