2005 Buick LeSabre Questions

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I have a automatic and when car warms up and changing gears from slowing down or stopping I have replaced left transmission mount and is still doing this transmission has been checked for problems codes show no problems
It just started today
after a stop light I notice at around 25 mph it lunges or skips. Once I go faster everythings ok.
My 2005 Buick lesabre shakes hard, makes a screeching grinding noise and vibrates in the engine area when in reverse or park. I had 2 motor mounts replaced along with the spark plugs. What could be the reason for that?
I have noticed the front left wheel has been making road noise more when I turn to the right then the left for about a month now from what I've read online I believe it could be a wheel bearing going bad and I know I need some brake pads would this be the problem of the warning lights
Why does my heater blow out cold air
Then it died put 5 gal. gas in it still won't start after trying serval times.
I am getting error code p0442. My gas cap loose message comes on randomly also. I'm also running through gas faster than usual.

What seems to make the problem better or worse? same problem
How long have you had this problem? couple days
I change the battery and after I get strong gas smell inside of my car. Smell is more strong after park or stop on traffic lights. When car start going smell is not so strong or gone. What it can be?
a/c is not cooling, has plenty of 137A
just got 05 LeSabre a wk ago. didn't pick up on it @ 1st but radio doesn't cut off nor headlights ding when left on sometimes. Oreillys said may all be linked to ignition switch which makes sense. I would think a sensor in door jam maybe but I've no idea. TY 4 help
2005 Buick. Lasabre cold air is blowing when the heat and defrost is turned on. Even after the car has ran for 15mins. First time buick owner. Need specifics on what auto parts to purchase to keep the car performing.
And the car is slightly rumbling & when I drive it if I sit somewhere for too long like at a traffic light for example it shuts off then I cut it back on & it starts again
what non metallic part in the eng. lube. sys. fails in 125kmi. or more. causing upper eng. starvation? (1997 to 2005 3.8 lasabre eng.)
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