I have a 2010 xfire that flashes code 21 at about 80 mph. thought it was bad gas so drained it all out and put in fresh gas in and changed the plugs. It is not rpm problem it seems to be a speed thing. At about 80 the motor clipps off and then drops to 75 starts to pull till again to 80 and so on, please help!!
Its at the dealer but they have not returned my calls and i'm going nuts not knowing what is wrong and why.
Its at the dealer but they have not returned my calls and i'm going nuts not knowing what is wrong and why.
