Recently ive had problems with my b17a stalling out. The car is running well except for when i come to a complete stop after the car is warm. When i do, my vacuum guage goes up to 13-14 in. and my rpms drop low to around 400. I am out of ideas over what could be causing this. Any suggestions? Does this indicate i have a vacuum leak? could it be an injector(s)? Or maybe a problem in the valve train itself? what should i look for? thanks