Shuts off while driving

Air Conditioning problem
2005 Chevy Trailblazer 6 cyl Two Wheel Drive Automatic 75000 miles

My trialblazer stops running when I turn on the
ac, it runs going down the road but stopped at a stop sign it quits. Ac works fine, gets cold.

Nope the check engine light has not come on someone told me that it could be the throttle motor or sensor does this sound right?

Electrical problem
2005 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 22800 miles

I just purchased a new/used 2005 trialblazer LT v6 fully loaded 2 weeks ago. I first started to notice a problem when I would start the car after it sat for awhile. I would start the car and the headlights would flicker maybe once every 5 seconds. I started to notice that the volts would drop from 14 to 12 or 13ish and then shoot back up to 14 15ish. I used to work on cars previously so I know this was not a good thing.. After about 3 days of this, I woke up one morning and I started the car and it shot to 10 volts for like 5 seconds and then shot up to 14 and started doing the flicker thing. The next morning I started the car and it did the flicker thing and then my radio shut off and restarted.
At this point I called the dealership and I took it in. They claim that it was a bad ground. Again this did not sound right to me. I took the car home not satisfied with the answer. That night I went to start the car and go for a spin. I started the car and it flickered once or twice so I was a little worried. I put the car in reverse and the car stalled out as I was reversing. To me it sounds like a short or a computer problem. Any ideas? Please help

Well so far I have gotten a ground on circuit d221 replaced (?), The ground on the fender(connected to the battery) replaced, Power Fuses (under the hood ) replaced, ignition switch replaced, and alternator regulator replaced as well. I will know by this week if any of those were the problem.I will keep you updated

My 2005 chevy trailblazer started to do the same thing. The lights would dim on and off or around 5 seconds before returning to normal. I took it to advance auto and they hooked a meter up to the battery to test the alternator. They said my alternator was about shot. I replaced the alternator and all seems to be working good.

Engine Mechanical problem
2005 Chevy Trailblazer 6 cyl Two Wheel Drive Automatic 84000 miles

what make your vehicle not crank up but later on it does? Not only that but when driven the radio cuts off