High idle and revving?

I cleaned iac valve and it did drop but it is still running at 1200 rpm. Should I replace it or check something else?

Thanks, it was a bad iac valve and its good now. I also have a power stearing fluid leak and from what I can see it is leaking right in front of the steering column. Do you know what that is and will it hurt it if it isn't a cheap part to replace if I go a week or 2 like it is. It only takes a day for the whole qt to drain.

Changed head. When replaced now transmission wont work in reverse and keeps engaging and disengaging in drive. Engine runs good but idles normal for awhile than idles 2-300 rpm high than normal again. Codes are po135(high idle) po303(misfire cycl.3) was fine when turned of to change head.

I suspected it might be left head because of misfire in cycl. 3. I did all things on head as you asked and suspected possiable bad valve as head was not new. Thank you for verifaction

Thank you for your assistance

Some one please help me. When I start up the engine it idles way high for a bit then works its way back down, but if the engine is warmed up and I run in the store or turn it off for a minute while engine is still warm and start it back up it will idle fine. However, when I get in to start it in the morning or anytime of the day and the engine is not warm it will idle very high for a bit until it works its way back down. Can some one please help me fix this? It has the 2.4l l4 automatic.

I am am going out to look for disconnected or cracked vacuum lines now. When I start it it will go up to about 2000 rpm's and stay there for about thirty seconds and will slowly start to decrease.

I hit a pothole recently and ever since the idle has been a little high. How do I adjust the idle? Please let me know.
Thanks,
Paul A. Smith

I checked my hoses and found a little med. Size elbow. Hose on the bottom of the firewall just there nothing attached to it, and I found a long skinny plastic hose connected to the air filter hose also not conneted to any thing. Are they suposed to be like this? Please let me know.
Thanks,
Paul

Thank you so much for your help. So your telling me that there is suposed to be another hose that connects the two? Should I bring it to the dealer to find out what size hose and to see how long the hose is that I'm missing? Please let me know.
Thanks,
Paul