Member - Nick (TAS) replied:

Don't know much about them but I'd guess it has an automatic choke.Could be the thingy that controls this.(sorry carnt think of it right name)
Other than that could be a cracked air line on the polution gear,they have a habit of Idling up a vehicle.

madlee replied:

Word of warning-don't touch the trottle stop screw. You need to put it back to correct setting of 1/2 a turn from when the screw touches the throttle lever.It needs this so the throttle position sensor is correct for the computor to know were idle is.For it to be idling high,possibilities are;fast idle unit faulty or the heater hoses to the unit are blocked(toyota's are very hard to get to,normaly underneath throttle body);idle control motor or system faulty.Basicly something is letting to much air to by-pass the throttle plate.As you have change the heater hoses,make sure they are on the correct way and make sure you didn't knock anything off at the back of the motor.Because the engine management system uses an air flow meter,any air leaks such as the brakebooster hose or a vacuum hose should make the idle rough if it still runs at all.If you can't rectify the problem,see a good mechanic,we are out there beleive it or not. GOOD LUCK

Member Eric replied:

I would say you have a vacume leak . When you did the heater hose , you either broke a plastic vacime pod , or knocked a hose off .