this just started this weekend i have a 2001 f150 5.4 temp outside was in single didget started truck to warm up idle about 1000 rpm's put into gear with foot on brake idle increases to 2500 rpm put it into park and stays at2500 rpms no fault codes anyone have a idea whats going on? my first thought is some sensor on transmission telling engine need more rpm's

 

Sounds more like a stuck IAC (idle air control) to me.