Buick Century Questions

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So at first my car started jerking very bad after a 2 hour trip right after replacing my starter which was never bad I just figured I'd replace it bc it was old when accelerating from 0-45 mph it would jerk very bad and then just lose power I had the codes for camshaft sensor and crankshaft sensorso I replaced the cam shaft sensor and both codes disappeared I also cleaned the egr valve passageways , cleaned the throttle body and maf sensor a month before all this I replaced the fuel filter, replaced spark plugs and wires and did a fuel system cleaner also dropped the trans pan and replaced filter and gasket it ran fine for a few days and now it's jerking at higher speeds and seems like it wants to cut out now I can't drive over 45mph without the car bucking and jerking all over the road what is my issue please I need help I work on cars but am not an expert
Since I purchased the car around a year ago, there has been a noticeable situation when backing out of driveways, parking spots, etc. It seems like there is a momentary clicking near the front brake/tire area that I'm assuming is some sort of additional release because, at the exact time that happens, the brake pedal also depresses allowing it (and my foot with it) to get closer to the car's floorboard. It's similar to having to bleed the brake lines, only this instance only lasts for a moment, only when backing out, and only if the car is operating on a new start/ignition. If you leave the car running prior to backing out, the problem does not exist.

Additionally, about 10% of the time, when the clicking occurs, the display panel lights indicating BRAKE and ABS will come on and the steering gets a little tighter. The only way to rid that situation is to shut off and restart the vehicle.

I've yet to find a solution to this. Any takers? Thank you in advance.
The issue is when you select
defrost vent or heat, the air consistently
blows the same speed through all of the
vents equally.
Blower is blowing air through all vents and I am unable to switch it from defrost to vents to floor. Just put in a new AC door actuator. Still not actuating the doors. The wiring harness has been plugged in, just not getting current. Could it be the AC/Heater switch?
I can go about 60 miles then it will die wait bout 15 minutes it starts gain and then it dies about evert 5 miles my security light is on and also when it fies all dh bord lights come on then they go off nd the only light on is the security lightand ometimes check ingine light comes on then goes off

Temp control doesn't work, continuously blows hot air through vents.
My girlfriend just bought a 1992 Buick century, it has 110,000 miles on it, there is nothing wrong that I know of and it seems to be an awesome car! But one issue we're having is it's going into gear really hard, but doesn't shift hard? When we put it in reverse it clanks and shakes the car, it does the same when we put it in drive. But it doesn't shift hard on the road, and sometimes we can feel it downshift, what could this possibly be? There's no check engine lights on, and the transmission fluid doesn't look all that bad! I know enough about cars because I work at a quick lube and preventative maintence store but don't know anything about older cars, is it normal for this to occur with these? Or could my transmission be going out?
Transmission also shifts hard plenty of fluids
We removed the bar holding it down, but there is no room the way it is designed to lift it straight up. Thank you
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