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2001 Buick LeSabre Questions

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182
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my 01 lasabre went down down about 3 weeks ago. well I went the next week and put some gas in it just to make sure it was or wasn't the fuel pump. it started, I was able to drive for about a week and no soon as I filled the tank up it went down again. is this a sensor issue? or do I have to just change out the fuel pump?
I have disconnected the battery and it will stay charged when not connected to the car. The alternator is putting out 14.9 volts. I have disconnected the underhood fusebox and rear fuse box. Then reattaching them noting the voltage at the battery. That load does pull the battery down but how do I further isolate the voltage drain?
it started out fine, everything was working, then i noticed traffic flying past me so i pullover and check with my garmin, the speedometer had to reach 80 for me to be going just 50 mph. i have to have my car for work so this is just crazy as well as dangerous
Every time I turn on the radio, within 5 minutes the battery will stop working.
Leaking from Manifold and I cannot yet afford to take it to a mechanic.
Still mis fire swapped out module with one from yard same thing moved coils around same thing what gives? Any help greatly welcome thanx
My pedal started to go to the floor and I am not leaking any fluid

The plug for hot and ground what are white wires for
Car was driving fine noticed one morning it act like it didnt want to start but it did after two trys, later that day go out to leave and it just wouldn't fire, it acts like it wants too, tried crank sensor already.
Already installed new radiator and water pump
The hoses on both sides of the engine are hot but radiator is still cold
The audio alerts still work. But I can't tell how many miles are on my car now
I have replaced the window motor regulator, switch and the control box. Everything works and the car sits overnight and then the drivers window does not. Now the pass Rear window goes down and then won't go back up. Car sits for 15 min then rolls up a inch at a time. What is the issue?
I press down the CC button then press Set Coast and sets, but does not stay in effect unless I keep the CC button pressed down.
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