02 stang gt mildly built with stage 1 cams and all the usual bolt ons.when i downshift to slowdown in traffic 4th to 3rd etc., and clutch is depressed,it sometimes just dies and i have to pop the clutch to restart.it was all tuned by alternative and with this exception, all is fine,idle,throttle response etc.i'd suggest ideas from you stangers out there.i did put on a new iac but that didn't solve the problem.