I have a 2001 Dodge Dakota SLT 4WD 4.7 with automatic transmission.
I'm wondering what the normal idle RPM should read on the tac when the truck is at operating temperature and without the A/C being turned on and with the gear selection lever in the PARK position.
And then again with the truck in gear and with the A/C on...if there is a difference.
I can't seem to find this information in my service manual.
Thanks

 

Not sure on the 4.7

I believe the pushrod engines are target 650 RPM regardless of condition. The IAC opens a little more with AC on to make the target RPM under load.

 

What Magnethead said goes for the 4.7L too. It stays at 650 rpm, no matter if the AC is on or off.

Edit: Actually, I checked while in gear. I'll throw it in park next time and check that too, but I believe it won't change.

 

I tried it in park. So it's all the same. The RPM stays at 650, no matter if it's in park or drive, AC running or not.

 

Thanks for all your replies. I shot some throttle body cleaner through the rubber breather connecting tube while the truck was running. I then flooded the system until the engine stalled and let it sit overnight. Next day I did notice and significant difference in performance. The idle settled down to 650 RPM. The tac needle dropped only a tiny bit when I turned off the A/C.

 

New IAC and TPS (mopar) will do wonders. I will never forget how my truck changed from a jerky SOB to feeling like a big sedan when I swapped the TPS.