Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 47Get this manual
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PROBLEM 2: Engine Runs Uneven or SurgesPROBLEM 1: Engine Idles Rough and StallsPROBLEM 3: Engine Will Not Accelerate Possible Cause
Check air vent on fuel tank Air vent must be open all-theway a