just resently started having problums with my car.it starts but hard to start but when it starts it idles high but when it warns up it idles fine. i can drive it but i half a mile down it shuts off. but will not restart. but cranks. im thimking it might be the ecm . no check engine light on.new fuel pump has plenty of pressure. i need help with my car if anybody has had this problum before. thanks in advance