[A26B]

I'm going out on a limb here.....

Before you remove your "ticket stopper"

unplug the TPS to keep it out of C/L just to see if the ECM is inducing the idle speed based on errant readings, such as vacuum leaks. An engine can still run pretty smooth, although idling high from vacuum leaks.

Assuming the idle speed is still high, start checking for vacuum leaks in not so normal areas, using a propane torch with a rubber hose on the end (remove the burner tip & put the rubber hose on the small pipe from the valve)

Check around each injector where they fit into the injector housings, the T/body shafts where they fit through the throttle body, the Dual PCV hose system, from the inj hsngs, all the way into the plenum, the connectors to the 2 hoses into the plenum under & behind the t/body area...... and anywhere else you can get to, including all of the intake gaskets joints.