I have a 96 dodge ram 1500 and its making a LOUD hissing noise every now and then. This hissing starts then the engine starts to die and then it REV's UP. I took the intake off to find out that its coming from the throttle body. Just above the two oopeningthere is a pplungerlike thing...its sucking air through and thats what making the hissing...how do i fix this...i removed and cleaned it...no luck...THANKS!