Cleaned the TB and replaced the IAC with a mopar one. Still have high idle. I will start and idle at 900 to 1000 when cold. Then as it warms up it will climb to 1200-1300. When I put the tranny in drive, it seems to idle around 800-900. If I shut off the truck when it's warm and restart it then it's at 1000 again for a few seconds and returns to the 1200. I have been checking over all the vacuum lines but don't see anything bad. Runs really good except for that. Starting to frustrate me.

 

I am having very similar problem only resetting the computer doesn't always work. Is the ECU mentioned the same as the PCM (this is what the computer module is called on my '93 Dakota 5.2L 4X4 with auto) ? Thanks. I checked auto parts and they want $189 plus $95 core fee. UGH! Thanks