2002 Buick Century Questions

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Century 2002 custom.
The car cranks and after about 8 seconds kill. Only when it's cold. After getting to the normal temperature it kills sometimes. then whenever I step on the gas pedal, it doesn't accelerate with power, or constantly, it feels like it goes up and down, but never get to the normal point of power, and takes forever to get to 40, it's like it doesn't have power. I checked all the fuses they're good, and I changed throttle position sensor, the one under it, cleaned the throttle, cleaned the MAF, and it doesn't give me codes... People said catalyst converter, but it doesn't get red... And I changed the oxygen sensor on it too... IDK what else to do.
Please help...
Thanks and God bless
There's also a security light on
It's won't start no clicking no ignition
When it dose start it has no problem drives great.. But I don't turn it off until I get home.. If it is going to start it starts right up it don't die it run great if it starts everything works fuses r all good. Senses r all good. Don't know y it won't start please help me
I was driving on the road when my car completely stalled out. i thought it was just a dead battery so i had bought a new one but nothing turns on anywhere in the car. the engine doesn't even click or hum when the key is turned. could it be the alternator?? Any advice would be greatly appreciated.
My driver's door window won't open with the control, but opens all the way every time I start the car. I can close it, at least for now. Will it stop closing if I don't get it fixed? Will it be expensive to fix?
Car starts and idles great but has no acceleration unless you punch and than takes off. Replaced in line fuel filter, plugs, and cleaned E G R valve no change. Service Light flashed but still does not stay.on. when First start in morning runs the way. It should very briefly
It switch out no problem
when you floor it it takes off. will not accelerate when slowly pushing on gas pedal. no engine light on but has flashed a couple times
Checked fuses and everything
It will start if you don't go all the way to the ignition switch stop.

I suspect there is a problem with the switch.
What do you think
When driving all the time. When vehicle is stopped, it stops too. Definitely not the brakes. No shaking, just a humming singing type of sound.
We keep putting batteries into this car and after few months its dead. We have gotten 4 batteries within months. We have a rebuilt alternator that i think is the problem because this our 2nd time getting it rebuilt. Can the alternator be the issue? Starter checks fine. How can i check for a parasitic drain also?
02 Buick century and damn battery keeps draining. First time it was alternator. So we got it rebuilt with lifertime warranty. Second time it drained it was the alternators diode's that were bad. Now this time I believe its the stupid rebuilt alternator. Starter is fine. Might as well buy new alternator!!!!
It's a v6 and should pick up like it use to. There is no misfire. It just doesn't want to pick up like it should. It also does it on flat ground. Please help. Thank you.
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