ok checked all plug wires and no light show. but when i was checking the plugs the #4 plug was very wet all the others looked good so i did a compresion check on #4 and it had 15 lbs. so i started to look in to it and i pulled the valve cover off and no push rod on the #4 intake valve and the lifter had come apart. i pulled the broken pieces of the push rod out and pulled the lifter out and replaced them.it runs alot better now but when i put the car in gear it starts to stumble and want to die it has power breakes and they are working but could i have a leak in the vacume to them or might it be somthing else????