Hi, I'm pretty new to the forum and now I have a problem. I have a 97 f-150 s-cab 4x4 with a 4.6 w code motor, auto trans. When first starting out the truck idles great. Once it's warmed up the rpm's fall and it either comes close to stalling or it does stall. It does this when it's in gear. I did a search on the forum and most pointed to the IAC valve. I took it off and cleaned it with no better results. The CEL is not on. Can someone else point me toward another problem that is causing this. Any help would be appreciated.

 

Try cleaning your MAF sensor.