From the driver's side fender, look at the carburetor. Near the bottom and towards the back, you will see two small Phillips-head screws. The upper (SAS1) and lower (SAS2) both control idle speed. LEAVE THE LOWER ONE ALONE!!!
Start the truck and let it warm up to operating temperature. You'll need a tach that is visible from the engine compartment--I got mine at Sears for like $30. Anyway, the factory spec for warm idle is 700 +/- 50 RPM. Use the screwdriver to turn SAS1 (the upper of the two idle screws) until your tach shows revs in that range. That's it, you're done.
Idle speeds can vary from 500 to 1200 rpm
Adjust your idle.
Idle speed is set by the PCM and IS NOT ADJUSTABLE.
The computer will hold it between 600 and 900 rpm.
If it is and automatic transmission the idle will be at about 900 RPM and is not recommended to be adjusted but can be adjusted at the trottle position sensor (TPS) located just abouve the air heater intake on the driver side. If the truck is a manual transmission the idle should be in between 700 and 850 RPM and is not recommended to be adjusted but again can be at the TPS.
The proper idle speed for a Dodge with a 318 cubic inch engine about 475 to 500 RPMs. Any idle below that will cause stalling.
700 rpm
Idle speed will vary from 600-1000 rpm.Idle speed will vary from 600-1000 rpm.
change the TPS Throttle Position Sensor
It is normal for the RPM to increase a little when put in park or neutral. If the RPM increases by a lot, then you need to adjust your idle speed.
the idle is controlled by the computer should be about 700 rpm's
Idle speed could be 550-900 rpmIdle speed could be 550-900 rpm