Took car out to get fuel 94octain,Car was running real nice!Next day went with the car, service light came on ,then car fell on it face! Fuel trims seem to cut back. So went back,check code!! P0101Mass air flow came up, went over the whole car, check for vac.leaks, check fues ok! Check grounds,even change the mass air ,same!Check Map senors and even put in a new one, still the same,my question is can bad gas set a P0101 code???