# Rough Idle **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercury, villager\ **Created:** [September 30, 2009, 2:17am UTC](https://community.cartalk.com/t/rough-idle/37352 "2009-09-30T02:17:39Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![gfsvillager](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@gfsvillager](https://community.cartalk.com/u/gfsvillager)\ **Post date:** [September 30, 2009, 2:17am UTC](https://community.cartalk.com/t/rough-idle/37352/1 "2009-09-30T02:17:39Z")
My 2001 Mercury Villager idles rough, but runs fine when driving. I replaced the plugs, wires, distributor cap, rotor and air filter. Then I took it to the shop and they said it had a code that indicated the #6 cylinder had misfired at some point and it required an intake manifold kit (O rings on the the injectors), but that failed to correct the problem too. ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [September 30, 2009, 2:27am UTC](https://community.cartalk.com/t/rough-idle/37352/2 "2009-09-30T02:27:35Z")
Idle speed is controlled by the Idle Air Control (IAC) valve. If the valve is dirty or sticking it can cause a rough idle. ---
**Author:** ![gfsvillager](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@gfsvillager](https://community.cartalk.com/u/gfsvillager)\ **Post date:** [September 30, 2009, 2:40am UTC](https://community.cartalk.com/t/rough-idle/37352/3 "2009-09-30T02:40:38Z")
Can the valve be cleaned or does it need to be replaced. How can I tell if it is sticking? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [September 30, 2009, 3:07am UTC](https://community.cartalk.com/t/rough-idle/37352/4 "2009-09-30T03:07:20Z")
If sticky it can usually be cleaned - just blow it out with some carb or intake cleaner. I would also check for routine vacuum leaks - rather than something extreme like the manifold gasket. Did this shop have anything to say after they ran up a huge bill w/out fixing it? Did they happen to check the compression? ---
**Author:** ![gfsvillager](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@gfsvillager](https://community.cartalk.com/u/gfsvillager)\ **Post date:** [September 30, 2009, 12:15pm UTC](https://community.cartalk.com/t/rough-idle/37352/5 "2009-09-30T12:15:58Z")
No, they didn’t give much information on what tests were performed. I am trying to get my facts together on the subject before I confront them about their poor service. Thank you for the help!