Engine High Idle 2002 Gt

Rello

New Member
Aug 13, 2015
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So I have a 2002 GT(roush stage 1if it makes a difference) and recently I have had a code P0401 for egr come up. It then Started to idle anywhere from 1500 to 2000rpm at times. It only idled high after warming up. It's not a rough idle it gets there and it sticks. It's so bad that the car could drive itself in second car and sometimes 3rd when idling at 2000. I checked for leaks found none so I flashed the ecu and reinstalled the custom tune. It ran fine for 2 days then started to idle high again but the code never came back. Has anybody had this problem or can anybody help me out?
 
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+1 on the IAC. This is pretty common. They will either idle high, or cause low idle/stall problems when they are on the outs. I would advise avoiding non-genuine replacements if the IAC has to be replaced. I went through 2 defective out of the box IACs from O'Reilys before I went to Ford. Best Luck!