Very High Idle Only After Warmed Up About 20 Mins.????

You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. It includes how to dump the computer codes quickly and simply as one of the first steps. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix.

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 200,000 hits, which indicates it does help fix idle problems quickly and inexpensively.

BKM48198 said:

The codes seem to be emissions codes and EGR code, emissions stuff was all removed long ago and the car had been running good but after sitting all winter it started acting up. I've been working 12 hour days and haven't had a chance to go look at it myself but will this weekend if cleaning out the EGR didn't help, he took the EGR off and was going to clean it out to try to get rid of built up carbon. It just seems odd that it runs good for about 20 mins and then the idle goes way up, he has tried a base idle reset, cleaned the MAF wires, set the TPS, cleaned the IAC and TB.

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Do the Surging Idle Checklist one step at a time, the answer is in there...