Okay guys, same old 1971 50 HP Electrostat Johnson motor. Get it off the trailer, put key in ignition, raise warm start lever, turn key...it starts. Fiddle around a few minutes at idle, take off in slow motion to get pas no-wake zone. Finally, clear lake ahead. Pop the throttle to it and it takes off....runs forever. Head back to boat ramp, come off high speed and get to no-wake speed....put put into ramp. Put it in neutral and it dies. Dead... won't start w/o fast idle, won't start w/fast idle. Set about 15 minutes it will start and I can repeat the same senario. Just finished rebuilding carbs. Brand new tank and was checked for debri before putting gas in. Fuel filter is clean, fuel screen on motor is clean. What does the wizards of the outboard motor world think it may be?