Hey, got an 02 FXSTS that is bone stock for a while. Bike runs great, except at stop lights, where it decides to sometimes stall on me. Idles well, but from idle to 1/4 turn, she'll hiss and then maybe go. Is it because of the stock low speed jet, or a poor air/fuel mixture? Haven't looked at the plugs yet. There are no other symptoms, thanks.