'87 Merc 5.7 revs rhythmically between 1000-1800 rpm

H

Hikerboater

Cadet
Joined
Sep 20, 2010
Messages
6
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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