Disconnect the air ducting between the air filter box and the throttle. Clean your throttle body interior with a cloth and plenty of carb choke spray (WD40 is good too). Idling is controlled by the engine's computer and the Idle Air Control Valve IACV . This device allows air passed the closed throttle plate when the engine is at idle. Locate the inlet port in front of the throttle plate in the inside wall of the throttle body. Locate the IACV on the outside of the throttle and remove it. Give it and associated passageways a really good clean. Make sure the valve and valve seat are free of crud. Re-assemble and this should cure the problem
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