Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 64Get this manual

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1998 OFI Troubleshooting Guide (continued) Symptom 3 Engine idle is rough Cause 3.1 Low air pressure in rail (less than 79 psi while running) 3.2 Fouled spark plug See 1.2 Action
5.1 Fouled spar

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