1999 Pontiac Bonneville Questions

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Had read a tutorial on about.com. Seems like good general info but my tool box is limited so I make due. Need to know how important the wrench is to my vehicle.
replace the rack and pinion
I had a new plenum kit installed. Bad seals and small leakage when warm caused random misfires. got that fixed. Along with oil change and radiator drained and refilled. Now i have a knocking sound that wasn't there be...
Without symptoms will just quit running while driving. No indication to start for 5 to 10 minutes will start quickly and run perfect. Has no special time or event may run for 1/2 up to 2 days before stalling. Then aft...
I HAVE REPLACED UP-STREAM OXYGEN SENSOR ALREADY AND NOW WHEN I HAD IT JUSTED IT SAID DOWN-STREAM , EVAC SENSOR I HAVE NO IDEAD WHAT TO DO!!
does it require professional help changing the battery wires?
Air will bblow in any position I choose but when I turn the temperature towarm or hot it doesnot warm up or get hot.
It only does it when it wants to I don't get it
When i get it started and turn on the ac or try to roll up my windows it dies
This problem just started. When you go to turn on the ac switch, you hear it kicking on, but no ac blower air comes on. However, when the car makes up it's mind while driving, the ac comes on with cool air.