idle problem

[Antekaudi]

Hey.

This thing bothers me. When i drive everything seems fine. I recently changed sparkplugs and 1 coilpack.

But when the car idles from time to time there is drop in rpms. Like cylinder misfire but it only happens during idle .

Any ideas ?

16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

I also get this check engine light.

People say its catalyst converter but my car has only 27k miles.

Thanks

[gdawg'05a4]

If it is indeed the cat, you're covered under the federal emissions 8 year/80k mile warranty/law. Bring it to the dealer and they'll replace it.