Hi I hope someone can help me. My problem is when I start my car and put it in gear then let off the brake my car dies. It idles at about 650 before dieing. The brakes seem to work just fine. If i unhook the vacum tube to the booster it idels at 850 and runs fine except the brakes are hard to push in. If somebody has an idea of what I can do to fix this please help me.