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Originally Posted by bigdog
I have several boat issues I hope this forum can help with....
Engine is a Mercruiser 4.3 V6 (1995), with Alpha Outdrive.
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Dave advice is good. Could be u-joints, sometimes the vibration is always there just swamped out by other stuff when at speed.
If you dig down on the following site they have drawings of all the outdrives. You can find the trim position sender and the u-joints for that matter. If your really handy you can order parts and fix them. It's not something I would do.
http://www.mercruiserparts.com
I've heard you can disconnect the pitot tube from the speedometer and blow out the crude and some times that will fix it.