95 Z28 Camaro having trouble running

My camaro has 130k miles on it. Was running great and it started to have shifting problems so i had a rebuilt tranny put in it. So a couple weeks back if kept not wanting to shit and then it died. I
took it back to the transmission place that rebuilt it and they said they would check it out. They said that the fuel pump and filter needed to be replaced, so i went along with it and it set me back 600 for cost and labor. Got it back two days ago and it started up right away and ran great. Tonight i was at a drive through and it was idleing and kinda wanted to die, so then i was going and it wouldnt shift again and seemed liked it was overloaded with gas. Died, left it there. I am getting really frusturated, can anyone help, please.
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Tranny shop screwed something up. Borrow a scanner from an autoparts store and see what codes you got. At least if you know that much the shop may not be able to screw you around even more.

Thank You, Randy
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