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<blockquote data-quote="PrairieGhost" data-source="post: 106198" data-attributes="member: 704">I am not much of a mechanic Dave K, but reading this thing about running with muffs, but not in the lake makes me think it's electrical.&nbsp;&nbsp; Is your boat aluminum?&nbsp; I am wondering if it's grounding through the hull when setting in water, or perhaps just grounding through the lower unit.&nbsp;&nbsp; I once had an old 18 horse Johnson that did what your talking about.&nbsp; There was a wear in one of the spark plug wires where the accelerate linkage wore through the rubber.&nbsp; When in the water and I went to idle the linkage shorted out the spark plug wire.&nbsp; Did it some up on the trailer, but run better.I did have an old 1958 Chev wagon with a 348 and powerglide that I did all my own work on.&nbsp; Long long time ago though.&nbsp; Learned that it was tough on transmissions holding the brake and floorboarding it before releasing the brake. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown&nbsp; &nbsp; :(" loading="lazy" data-shortname=":(" />&nbsp; Especially on a car geared for top end and not 1/4 mile.&nbsp; Any other farm boys remember Saturday nights lined up in town with your hoods up so you could all check out what others may have done to their engine since last week-end?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool&nbsp; &nbsp; :cool:" loading="lazy" data-shortname=":cool:" /></blockquote>

[QUOTE="PrairieGhost, post: 106198, member: 704"] I am not much of a mechanic Dave K, but reading this thing about running with muffs, but not in the lake makes me think it's electrical. Is your boat aluminum? I am wondering if it's grounding through the hull when setting in water, or perhaps just grounding through the lower unit. I once had an old 18 horse Johnson that did what your talking about. There was a wear in one of the spark plug wires where the accelerate linkage wore through the rubber. When in the water and I went to idle the linkage shorted out the spark plug wire. Did it some up on the trailer, but run better. I did have an old 1958 Chev wagon with a 348 and powerglide that I did all my own work on. Long long time ago though. Learned that it was tough on transmissions holding the brake and floorboarding it before releasing the brake. :( Especially on a car geared for top end and not 1/4 mile. Any other farm boys remember Saturday nights lined up in town with your hoods up so you could all check out what others may have done to their engine since last week-end?:cool: [/QUOTE]

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