My buddy has a 2007 Street Glide bought new having had a 110 performance upgrade. Not long after taking delivery he began having trouble with the idle often near the 2000 rpm mark after coming to a stop. Blipping the throttle will not bring it back down, nor any other attempts. As usual it doesn’t always act up especially when he took it back to the dealer. Dealer says unable to duplicate condition. Yet as if it has a mind of it’s own, suddenly after coming to a stop the idle stays very high. Any ideas????