the tps isn't designed to go to zero, but the MAF will be close if the engine isn't running.. If you have an idle proble, it is most likely caused by the IAC. Also, the IAC opens in proportion to the throttle opening to act as a dashpot (like on older mechanical carburetor engines) to prevent gaskets from being sucked in and failing in the event that you snap the throttle closed at high RPM.
