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    Mercruiser I/O stalling

    My 2003 Mercruiser 3.0 I/O 135 hp is stalling right after it starts up. I can keep it running if I crank it up to 5,000 RPM but it dies as soon as I let up. Boat is a 17' 1985 four winns. Had it professionally winterized at the end of last year. Hasn't run well yet this season. Thought...
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    Mercruiser idles very low - sometimes stalls

    I have a 2003 Mercruiser 135 I/O on a 1985 17' Four Winns Horizon 170. It's idling very low, to the point where it's shaking the boat when in neutral. In addition, I need to warm the engine up completely before bringing it to idle or it will stall out. Any ideas on how to set to a good idle...
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    Mercruiser I/O won't start

    My 2003 Mercruiser 135 I/O is having trouble starting. I turn the key and hear a click, but it won't turn over. I was cleaning the wiring connections of corrosion to see if that would help. When I disconnected the yellow wire (see attached pic of starboard side of engine) from its post, it...
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