Have not driven the car in 4+years. Got it running about a month ago. I have a airfoil in the throttle body I added like 6-7 years ago. With the car running, you hear what sounds like a huge vacumn leak in the hole between the throttle bores. Even with the air intake hose and air cleaner on, you can hear this suction. Is this normal? The car has a stumble off idle and acts like it wants to die in gear. Please help! I did check the vacumn line under the throttle body, and it is connected.