High idle speed

[Jarrod32]

First off...2003 Dodge Dakota with the (woefully underpowered) 3.9L V-6, automatic transmission.

Normal idle speed for this has been about 700 RPM, but lately I have noticed a high idle speed. It doesn't happen when I am stopped at a stoplight or stopsign, for example...when it is in gear and I am holding it at a stop with the brake, the idle is "normal" at about 700 RPM (give or take).

But when I put it in park, the idle jumps to around 1050 RPM. It is still a fairly smooth idle; it doesn't rev/fade, but just idles a bit high.

Any insight as to what can be going on?

[Big Buck Buster]

Check to make sure there is no vacuum leaks.

It can also be the TPS. I have had a quite a few with erratic idle and problems with the cruise control set at highway speeds. This can be checked with a digital volt meter or scan tool.

[fishhuntwork]

I would say check the intake manifold gaskets, throttle body, or idle air control motor could be dirty.

[Gus]

Having AC on will kick up idle also.