S-10 dies randomly

I own a 2001 Chevy S-10, 4.3L V-6 extended cab with 68,500 miles on it. About a month ago my check engine soon light came on and I got it checked out at autozone. It showed a P-1104 code I think, which turned out to be the A.I.R. pump, well since it was just an emissions thing I thought I'd just get it fixed when i got the money. Well recently my truck has been acting really weird. My radio would shut off randomly while I drove and turn right back on and then if I came to a stop light it would choke and then die. Then when I try to start it right after, it chokes and dies for the first 2-3 tries and after that runs perfectly normal. I had it checked out again at Autozone, this time with NO codes at all, and now my check engine light isn't on anymore. The most frequent symptom is whenever I turn off the truck all my accessories like my dome-light, radio, windows, etc. all turn off with the engine. My truck has a 20 min accessory thing when I turn off the truck so I know they're supposed to stay on, and always have before. Well if I go to start my truck again right after it has the same symptoms as before and will restart but die right afterwards for the first 2-3 tries. I haven't done any engine work or anything at all on this truck in quite a while. I replaced the fuel sending unit about 3 months ago and changed the oil about 2 or so months ago, and everything was working fine, until randomly. I've already taken the truck to the chevy house and they thought it was the computer so they reset and updated that and then they said the fuel filter was clogged (which I changed with the fuel sending unit). So I changed the fuel filter (which wasn't clogged) and the problem still exists, so I took it back and now they're saying that the fuel pump sounds a little weird and needs to be replaced. I'm gonna take it to someone else b/c I really think it is an electrical problem but I don't know. Thanks for all your help and sry for the long post.