Truck Repair: 98 CHEVY SILVERADO 5.7L 350 4X4, vacuum hoses, chevy silverado

Question
WAS IDLING HIGH WILL DRIVING BUT WHEN COME TO STOP WOULD DROP DOWN TO NORMAL.HAD TESTED AT ADVANCE AUTO SAID IDLE CONTROL AIR VALVE CHANGED THAT NOW WHEN I START TRUCK REVS UP TO 2000 RPMS THEN DROPS DOWN TO NORMAL DIDNT NOW IF SHOULD CHANGE THROTTLE RESPONSE SENSOR

Answer
You can clean the idle air control valve, usually without even removing it from the throttle body.

The TPS should be tested before replacing it.

Give it a day or two to see if it "Learns" before replacing anything else.

Check for loose or broken vacuum hoses also.

Van