1993 Buick LeSabre Questions

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was going out of gear after heating up changed fluid now goes good 1st and 2nd hangs in 3rd until you accelerate will go into cruise control
Won’t start stalls when coming to a stop
We turned the air on a couple days ago and the air came out the dash vents after only coming out defrost for several months. It worked until car was turned off. Then next time we turned it on air came out defrost vents again. Been doing this at least 5 years. Bottom line---Air comes out defrost vents most of the time. Like I said above, I replaced a couple bad hoses going to firewall, so, there is strong vacuum there.
We have replaced the battery, alternator, and also the crankshaft position sensor. We have tried a mass air flow sensor and a module sensor that did no good. The fuel pump is still pushing out around 47 pounds which is normal.
It starts wen it feels like iy and other times it wont syart at all
And car wont start now
car will warm up after 10 minutes
Not sure which to use 134 or r12
Replace it . Installed plugs and wires still ran rough. Checked plugs spark discovered plug No.1 had a weak spark,replaced all 3coils while doing job must have created a spike in system cause my Tack nor my Batt. voltage gage work to add insult to injury my DLC is no longer functioning. All logical directions will be greatly appreciated. 3.8liter model. Tenth digit in Vin is the letter P but it's registered as 1993 with L-series Eng. Sequential fuel injection
need to replace wires under engine
want stay runing if you not on the gas
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