That Would Be Your Idle Air Control Sensor The One Mounted On The Throttle Body On The Under Side There Are Three 10 Bolts To Take Off And Some Hoses But Once You Get It Off Unscrew The Capped End And There Will Be A White Screw With 2 Notches In It Take A Screwdriver And Turn It Clockwise Untill Tight If You Take It Off And Shake It And It Rattles Then Forget It You Need To Get A New One Eithr From A Part Store Or A Wrecking Yard