AC is a heavy amp draw when the compressor in on.
I would check most wiring in the engine bay including clean/fix all ground points.
See my Cave, Wire Service
and rest of section.
Check volts out from alt when engine runs at output on alt AND red wire to Alt side plug then at batter and + block under C500. All should be very =.
Turn on AC, Headlight, etc, and check again. One at a time then more at a time turned on.
Good alt should be ~ 14.7v but iffy wiring can cut that volts big time in a lot of places.
Example: Most Fiero have wiring problems to front then wonder why HL are dim, cooked relays, slow/dead motors, etc. Why? See my Cave, Electric Motors
Front wiring often drops ~ 1v even when everything is good. Just 1 crap connection can easily eat 1-3V more so might get 14.6v in the rear and front only gets 10v or less. Big ones are HL and HL Dimmer switches have crap connection(s) and even they get hot, even cooked, because of contact resistance.
Yes, Check all parts getting vacuum and EGR parts.
Then check O2 sensor and wiring.
Then check exhaust for leaks upstream of O2 sensor.
44 is ECM is ADDING fuel to the max and still have problems trying to get fuel right. (45 does exact opposite Cutting fuel and still think is too rich.)
Vac leaks, exhaust leaks and/or O2 can cause 44.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave