This could be a faulty IAC (idle air control) valve, a needed tune-up may also cause this.
SOURCE: 1989 honda prelude enigne idles high then low irratic
I had the same problem on a Rover. There was a leak in inlet manifold that was caussing the problem.
To verify, spray some sealant to temporarily seal the inlet manifold .and the eratic idling should disappear for some time.
If it does, you know there is leak in inlet manifold which you can take of and refit with a new gasket.
SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine
if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
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Nissan Pathfinder Backfires?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm?
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000
RPM?
http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.
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How is the idle adjusted?
The idle is adjusted as needed by the IAC which is controlled by the computer. There is no provision for a manual adjustment, however a seasoned tech will have the ability to do a manual adjustment but most reputable ones will not do it.
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