I'm not too familiar with those specific motors, however, most OMCs of that vintage are pretty similar.
The first thing I would check would be the filters. If you haven't replaced the filters already do that before you try anything else. A plugged filter can cause all sorts of running problems. The large filter should be a fuel/water separator type. Make sure there isn't a significant amount of water in it. Also, make sure the gas is fresh.
After that, I would check the fuel pump. You need to confirm that the fuel pump is the alcohol resistant, updated one. It should have a brown tag on it saying so, if it is. Unless you have used exclusively ethanol free gas there is a chance that the fuel pump and other parts of the fuel system are starting to soften/deteiorate due to exposure to the ethanol.
Even if it is updated, the pump it self does have servicable parts. That would be a good place to start.
Then it is on to the carbs. You might as well plan to do carb kits. Get everything all cleaned up and fresh.
It does seem like whatever the issue is, it is fuel related.
Where do you do your boating? I have been keeping my eye out for a nice, yet inexpensive Quest. Is yours a center console or a dual console?
The biggest thing holding me back is the fact that they are all powered by old carbed two strokes. They are fuel monsters. If I were to find a good dual console Quest, I would likely try to repower it with a Evinrude Ficht Ram / DI or an etec if I could find one cheap enough.
Good luck with yours and welcome to the forum.
_________________ Current Operational Boats: '04-Four Winns 180 Freedom 150 HP Evinrude '72-Chris Craft Commander 31 Sedan Twin-350Qs
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