1. Adjust idle rpm by adjusting the throttle cable. The throttle cable adjustment requires two wrenches. I use a 12 mm open-end wrench and a small adjustable wrench. Loosen the nut on the right and tighten the inside nut on the left, until the idle speed increases to around 700 rpm. After the desired idle speed is reached, use one wrench to hold the right nut while you snug up the nut on the left. If erratic idle continues, proceed to Step 2, below:
2. Here's how to remove and replace the Ignition Control Module (ICM):
https://www.askmehelpdesk.com/cars-t...tml#post265896
Personally, I would replace the ICM, coil, and rotor, while you have the distributor cap removed.
3. There's a throttle cable bracket that requires checking. If the cable pops out from the bracket, it can significantly affect idle rpm and operation of the throttle.