ok...i just installed my throttle body and aluminum ds and ford racing valve covers....i was expecting a tq loss from the tb, and i really notice it in 3rd and 4th.....after the install, i notice the car idling around 600 and 800rpm and when i let off the gas, the car will start idling down...i know it will idle down by itself but not right after i let off the gas, it also does it between shifts....what do you guys think? you think i have a vacuum leak somewhere? im gonna go check tommorow morning