2001 Buick LeSabre Questions

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my '94 got around 30 32 on highwy. so was expecting the same about. It runs great starts right up but the mileage is awful! what to do ???filters ? computer read out doesn't show anything check engine light is not o...
For example, i put the key in the ignition and it will not start unless i give it gas. I have even trued jumping it and still no effect? I have replaced the battery, alternator, MAP, MAF, IAC, and TPS sensors.
Check Charging system error. Test indicate bad battery and bad voltage regulator. However when jumped off other car with good battery the alternator IS producing and guage reads that it is charging... If started fro...
I filled the coolant box once before and noticed it was very low yesterday as I was running errands- filled it with water otherwise it would have overheated. Today I did a pressure test on it and it has an ongoing str...
Tach erratic, bounces at will but mostly rests at zero. Do not know what drives the tach, mechanical, electrical or vacuum but wonder if this is a precursor of future joy with my beloved Buick!
This vehicle doenst have dual climate control can this problem be diagnosed with a code reader?
.is it metal or aluminum and is it top or bottom
is there a reasonable price garage in my area of raymond new hampshire 03077
Just had gotten off work pull in garage turned my car off. Came back out maybe 15 minutes later pulled out and my air bag light came on . Now it's not going off .
2001 Buick, La Sabre with automatic level control. The rear shocks were replaced for stiffness and bad ride. 6 months later they are looking bad again. The rear of the car bounces going down the road and rides ruff....
Have replaced O2 sensor, plugs & wires, all 3 coils. And have cleaned the mass air sensor. Nothing has helped. Any suggestions?