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I was given a 1978 evinrude 70 on a 1984 gl***tream 1440. I took the boat out yesterday after emptying out old gas and putting new gas in and charging up battery and running in driveway with muffs on for about an hour. Ran great in driveway so I took it to the rive to see how it went. Well fired right up at the dock and idled great. Ran about 3 miles up river and decided to Fish a while. After sitting about 20 mins was ready for a new spot, motor startered right up but would not go to power it just bogged out and shut off. Started right back up but still no power idled down river for 10 mins then was able to go back to power no problem. Was able to go full power back to idle multiple times fingered all was good so went back to fishing. Shut motor down 10 mins later started right back up but again could not go to power just bog and shut off. 10 mins at idle and power is back. What could cause this. I thought maybe dirty carbs at first but that don't make since being once it goes to power I can run all through the power range with no hesitation. So what else could it be plugs look good water pissing out side of motor just fine so its not getting hot. I'm out of ideas please help.
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