# High idle when hot

**URL:** <https://community.cartalk.com/t/high-idle-when-hot/62469>\
**Category:** Maintenance/Repairs\
**Tags:** ford, f150\
**Created:** [March 10, 2011, 9:33pm UTC](https://community.cartalk.com/t/high-idle-when-hot/62469 "2011-03-10T21:33:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![F150Fanatic](https://avatars.discourse-cdn.com/v4/letter/f/65b543/32.png) [@F150Fanatic](https://community.cartalk.com/u/F150Fanatic)\
**Post date:** [March 10, 2011, 9:33pm UTC](https://community.cartalk.com/t/high-idle-when-hot/62469/1 "2011-03-10T21:33:45Z")

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You guys were most helpful in my last post, I have one more issue. I have a 1991 Ford F150, 351 Windsor 5.8L V8, with 177000 miles. When the engine gets warmed up, it seems to run a little rich, and when I put it in park or neutral, the idle surges way up (I don’t have an RPM gauge, but it’s up there). I recently cleaned the throttle body since the throttle plates seemed to be sticking. Also changed the TPS while I had it off. I put in a new EGR valve a few months ago.  
  
  
  
 A mechanic said I need a new throttle body, but I’m second guessing that. I’m wondering if I need to reset the computer somehow, since I installed the new TPS. Or maybe clean out/replace the IAC? I know this could be a number of things, but since I’ve been focused on that area of the engine, thought I might have done something wrong. Any assistance would be greatly appreciated.