Weird idle

[rubbersidedown]

for some reason, every now and again my idle will go up to 3k and stay there.. while i'm at a dead stop. why is this?

[Natty]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (rubbersidedown @ June 01 2002,10:27)</td></tr><tr><td id="QUOTE">for some reason, every now and again my idle will go up to 3k and stay there.. while i'm at a dead stop. why is this?</td></tr></table><span id='postcolor'>
Leak in some vaccum tubing? A bad o2 or coolant sensor...
Some good places to start...