2003 Chevy Express van 6.0 started idling very high. Can't get it to stop. It had been idling to slow and put a new idle control sensor about 2 months ago and has been working great. Last night we were traveling on interstate at high speed for several hours straight, when stopping at a station it started to idle high and wouldn't stop.
I would take out the Idle Air Control Sensor and clean it along with the port it is in. The valve could be stuck open.
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