Automotive Forums

I have had my Pontiac for several years now. At 230,000 miles had the tranny rebuilt around June of this year. It now has 244,000 on it and has developed a strange problem. after the car hits operating temp, when I stop quick it shuts off/ stalls.The RPM's just drop. It starts right back up and idles perfect, runs fine driving, but just when I stop. Now it will do it when I put it in reverse on occation. I have replaced the throttle sensors, throttle body, fuel regulator, fuel filter, fuel pump, and spark control moduale. I have even replaced the t-bone motor mounts, first with metal bars to eliminate a motor rock/ wire problem, then new mounts.I get no Service engine light,(yes it works). I am out of ideas.