Was out the other day and after about ten minutes of running at about 3500rpms the motor would drop down to 1500 rpms and then go to 2500 and then back down and up again. I changed the water fuel seperator which had no effect at all. I know just enough to be dangerous but it seems like it is fuel related. It never runs rough just the rpm varies. When it would drop down to 1500 I could give it more gas at the throtltle which had no effect. Any ideas???

Probably need to have fuel system pressure and vacuum test run to see if has a fuel restriction in fuel lines or tank pickup or dirty filter inside VST.

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