I guess you have not resolved the idle problem?
A few things to check.
Is the compressor clutch engaging and is there a load, charged a/c system?
Is the throttle switch working/ properly adjusted?
What ECU is installed. ECU's prior to the 173 run 1.1 firmware which exhibits a jerkiness when the throttle is closed and compressor disengages. Swap ECU's to another of the same series or higher - 351,380,525,526.
Best thing for that Haynes manual is for it to be lost.
Do not dick with the idle mixture set screw or fuel pressure. You will screw up what is right. The ECU will be working overtime to compensate for what you are dicking with.
There is no idle speed adjustment for A/C operation. You are not working on a 68 Chevy!