I have an 08 700 XX, Barker exhaust, tuner, free flowing open air box I’m having a problem with the bike idling. I get a lot of flame out, sometimes I get a backfire before it stalls could this be a tuner problem? When I’m in neutral and I rev the bike up when the RPMs are coming down from being revved up they almost go down to low and either stall or spits and sputters before it comes back up to normal idle rpm may be a fuel problem?