2002 Buick LeSabre Questions

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it bearly starts and has a ruff ilder
No check engine light , everything checks good off diagnostic computer. Catalytic Converter is good , O2 sensors are good. Getting 13 mpg. Seems to really lose fuel economy fast once at an idle.
After using a scanner to try and erase the codes it shut down something and now my engine wont start
The blower stopped working. If I hit a pothole or if I "hit" on the dash, it will sometimes come on.
With AC on, I have warm air on driver side and cool air on passenger side.
ac sometimes it would come on when i hit a pothole and will start working fine
how do I change the oil pump on mt 2002 buick La sabre
on my 2002 buick La sabre
started after about 12 hours of sitting, lights in car came on, battery is about 4 years old
my head gasket blew so i just chose to change out the engine i have a friend who has a 5.7 l for sale just want to know if it can be done?