rps at idle

sometimes when im at idle my rpms will pulse about 100-200 up and down from the 1k mark heard that can be normal but not sure. today it was doing that pluse but every once and a while randomly it would go up to 1400 rpm then back to pulse at 1100-1200. what could this be please give me some info. :disappoin

99 gs eclipse headers, catback, intake

It is called Idle Surge.. the cause of it could be many things, cleaning the TB helped a bit for me. Search for idle surge for other stuff that could cause it. It is not going to hurt anything so i would not go change ever part that could be causing it. Not worth it IMO, unless you reallly cant live with it.

TB? sorry im still learning. oh throttle body?:smokin:

my eclipse was doing that too except mine was dropping to around 6-700 rpm.changed the plugs and wires and it stoped.dont know if that will fix yours but its woth a shot...not too expensive

Check your TPS sensor . Its usually the culprit of an idle surge. Either its dirty and needs cleaing or you need a new one. You can find it on the throttle body. Take an ohm meter to check it.

-v3rtikal

^^ Yes! Use an ohm meter... Don't try to adjust by just the screw on the front of it. :nono:

(yes I've made the mistake myself) :banghead:

That's if that's the problem.