I never buy gas at tthe cheap place. For one thing who is cheap keeps moving around. Then the cheap place is a nickel cheaper. Looks dramatic up on the sign but the bike only takes 6 gallons so I save 30 cents. And I gotta drive in-town traffic to do it. A load of bad gas can be immediate but intermittent. Gas is really only good for a month. Winter gas is not the same as summer gas if you live someplace with winter but I don't know how long it takes to change the tanks over. I never buy gas at a place where there is a truck loading the tanks and stirring them up. 'round here you can borrow a comp tester at most FLAPS. might nee a deposit. Has to be the screw in type, not the hold-in type. Compression problems are not intermittent. If the bike ran and idled then you know the idle circuit is ok. look at the next circuit up. vacuum methods don't quite shake out the circuits in order and they account for mixture and spark poorly.