1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 100Get this manual

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PROBLEM 1: ENGINE IDLES ROUGH AND STALLS PROBLEM 2: ENGINE RUNS UNEVEN OR SURGES PROBLEM 3: ENGINE WILL NOT ACCELERATE Possible Cause Corrective Action Fuel tank air vent closed CheckAir vent must or

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