# Rough idle

**URL:** <https://community.cartalk.com/t/rough-idle/12237>\
**Category:** Maintenance/Repairs\
**Created:** [March 26, 2008, 10:41pm UTC](https://community.cartalk.com/t/rough-idle/12237 "2008-03-26T22:41:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ikeman70](https://avatars.discourse-cdn.com/v4/letter/i/9dc877/32.png) [@Ikeman70](https://community.cartalk.com/u/Ikeman70)\
**Post date:** [March 26, 2008, 10:41pm UTC](https://community.cartalk.com/t/rough-idle/12237/1 "2008-03-26T22:41:02Z")

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I have a 92 mercury cougar LE with a really rough low idle. The  
  
 rough idle disappears as the engine speed increases. Being a total dummy, I have no idea what is causing it. Being a total tightwad, I am looking for a cheap solution for the problem.

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [March 26, 2008, 11:22pm UTC](https://community.cartalk.com/t/rough-idle/12237/2 "2008-03-26T23:22:06Z")

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When was the last time you did a good, thorough tuneup with all new ignition components and filters?

How many miles does the vehicle have on it?

There’s a plethora of possibilities, from a worn out engine with uneven compression to a stuck EGR valve to a bad injector (1992 I think would have been throttle body injected). You can’t go wrong with a good tuneup, and many of the other possibilities would cost more to correct than the car is worth.