1986 Mustang GT Convertible

I have great news. I fixed the idle without a single tool. I remember hearing about Adaptive Strategy. I had an 89 Country Squire and a mechanic in Naples Florida used that on my Country Squire. I had a low idle after a battery had been installed and Adaptive Strategy is about relearning the computer. I figured if it worked for a low idle it should work on a high idle. Google Adaptive Strategy Ford Idle and the procedure will come right up. It is getting your car up to operating temperature, turn on all accessories, not just AC. Put in drive for one minute with brake on. Then let idle in park one minute after. Take for a ride. You may have to repeat after letting car sit and cool. I did a second time and it worked. My idle is now 800 to 750 and back to 850. It was close to 1700. A little bit of surging there but I can live with that seeing the system is 33 years old now. Did not want to sick a mechanic on my car with a wiring diagram. This is monumental. Hope it works for anyone having the same issue. Good Luck.