1990 Cadillac Fleetwood Questions

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It putts like a tractor when I dose start blow 20 it don't start
Sometimes stalls on an upgrade and brake
My Cadillac shuts off when I let up off of the gas pedal when I have the A/C running....I was thinking it had to do with the Carbeurator, however I had that re-built in 2013...seems like the issue has been occurring since then. What else could be the issue?
Original miles.....Checked fuse...Had A/C converted from R12 ....Blew perfect untill 3days ago
When I rolled the window down all the way it wouldn't roll back up. But when I press the up button nothing happens. When I press the down button I can hear the motor and the door bulges a little bit. Before this happened I would roll down the window almost all the way down and it would stop so I pressed the up and down button it would roll back up.
When I Press Down On The Gas Pedal Lightly It Shifts Into Drive ! Not A Good Idea ! This Procedure could Wack The Gears! Transmission Oil levels Is OK ! What Kind Of Adjustment Is Needed ? Recently I Install A Drive Belt ! The Tension Is Just Right ! !!
I would like to know what I need to do in order to fix this problem as its getting warmer and it keeps draining my battery. I'm not a car guy but if told what to do I can figure it out. Any help would be greatly appreciated.

Also, what parts should I need and is this a job I can do or is it going to cost an arm and a leg. Thanks for your help
thing what else could me the problem?
Put a battery in my 1981 fleetwood it touched something an now nothing works it has a6.0 engine
alls while idling or when put in reverse or drive.there are no codes,timing is fine.have also cleaned throttle body
Its a 1987 Cadillac brougham 5.0
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