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Steve, I have a 165 Mercruiser 6 cyl. in my service boat. Great old engines and they run forever. I have the distributor dwell and timing set perfectly, along with a rebuilt carb with perfectly set idle mixture. This engine runs perfect on ethanol free fuel. However running on the ethanol blend, it stalls after a warm restart, and needs one more start before you can put it into gear and go.I run service calls with this boat, so it sets for 30 to 45mins. between jobs. At first i thought i had a problem somewhere til I switched back to to ethanol free gas, then the problem instantly was gone! I’ve tried this a few times back and forth, with the same results. The old 165 doesn’t like ethanol, and runs great on pure gas. I had a similar situation on my Ranger bass boat that sits too much… my 150 OMC V6 is hard to get started after setting on ethanol…. fires up fine on pure gas. These tests were enough to convince me.