I have the EEC-IV in my Crown Victoria and know a little about it
Lets look @ what we know
car passed KOEO and KOER tests (indicated by codes 111)
Car's starting issues occcur on cold start in warmer weather
acceleration sluggish with wram engine and hot weather
Car runs much warmer with AC on than with it off
Wally or someone may have said some of this already -
Re-do your KOEO and KOER test and wigle the wiring around all of your sensors and see if you get codes - this will help identify wiring problems in the EEC-IV system
Just for good measure, I would test the coolant temperature and intake temperature sensors. These can be tested with a DIGITAL multimeter and by reading the instructions from a good manual for the car.
provides details on how to accomplish that.
This will rule out bad temperature inputs to the ECM which will cause the car to run lean but have not gotten bad enough yet to throw codes
Next, do what Wally mentioned and check the electrical grounds
Change the fuel filter and do a presure test on the fuel system (confirm values from a shop manual) looking for 30-40 psig engine running @ idle, 40-50 psig with vacume hose disconnected from regulator, engine running , 40-50 psig engine off, key on - we are looking for blocked supply or return lines, bad fuel pump.
If these things dont find the culprit, we will commence digging into the DIS ignition system since bad ignition modules and bad cam/crank sensors cause intermittent issues on warm engines as well. The only easy way to test some of this stuff easily is spend $20 on a new crank or cam sensor and replace it. There are some voltage test to run on your coil packs and ignition module if you want to go this deep.