HIGH IDLE in Park!!!

[FordExplorer18]

After I have been driving for a bit and the truck has warmed up....once I place in park the RPMS jump up to anywhere from 1500-2500 and stays there until I turn the truck off. HOWEVER If I turn the truck off and then right back on it idles just fine. Its only when I go from Drive to Park. It seems to be getting worse too(RPMS getting higher).

I have searched and searched and I can not find a vaccuum leak.

I cleaned the IAC and that did nothing.

What else can I try or check? Thanks

 

[Billy177]

try resetting the computer/clean the maf and check your tps

 

[FordExplorer18]

I have reset the pcm and cleaned the maf as well. guess ill check the tps...........thanks

 

[KPT]

Another vote for bad TPS. Mine went and my engine would idle at 2000 rpms whenever in neutral. I have a 5 spd though.

 

[jrgaylor]

I just replaced my TPS because of simular problems here is the thread
http://www.explorerforum.com/forums/showthread.php?s=&threadid=91397&highlight=high+idle+bad+tps
Joe

 

[Charlie's_93EB]

hey i had thesame prob. a month ago look here. http://www.explorerforum.com/forums/showthread.php?s=&threadid=92430&highlight=high+idle

Mine was a throttle cable, a .05 cent ziptie fix!!!
good luck

 

[FordExplorer18]

Where exactly is the TPS? It sounds like this could be it. Might as well go to autozone since its only 30 bucks.

 

[jrgaylor]

Just two screws and a electrical connection, pretty easy.
Joe