surging rpm

I have a 2001 V6 Rodeo 105,000 miles...

A little trouble starting this morning and then after about 100 miles I stopped and the rpms were surging between 1500 and 2000 when idleing...

Any ideas? Thanks in advance

intake manifold gasket.

Thanks for the response. I had the IMG replaced about 5 1/2 months ago (12,000 miles ago). I actually hope that is the problem, since I'm still under the 120K warranty, but would it have failed again so soon? Also, last time I never had surging when idleing, just stalling at stops...

check steering pump or its related parts.

No check engine light? Any performance issues?

Joel

no CEL...It ran fine the rest of the day, which makes me think it might be the IMG...