2005 Cadillac DeVille Questions

All 2005 Cadillac DeVille Questions

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the service engine light was on so i took it there and it is shifting hard other than that its running fine. Do I have to buy a new brand new pcm and can this have anything to do with the tcc code and why its shifting...
I am thinking of buying a Cadillac 2005 Deville Sedan. It is perfect in town, but on the highway at 65 to 75 it shimmies constantly. Should I buy thid car? What would it take to repair it?
I also have my check coolant level cash warning comes on and then goes right off
All of the sudden my service air bag light is on. Does anyone think it could be related to ignition recall. My car has not been in a accident. I'm taking it to shop . But should I spend all that money to have repair...
The maintenance log says change at 50,000 & 100,000 miles but the book says wait until the warning indicater shows.
Cold air on driver side, hot air on passenger side, all controls set to cool in normal operation
My cadillac car only has 55,000 miles and someone said the brake lines are rusted out at back wheels area and need to be replaced. Is this possible?
Everything else is working fine. Interior lights will not come on individually or by the dashboard switch. There does not appear to be a fuse just for them? Any ideas? I have 248k on the car and hate putting money...
startup when cold doesn't seem to miss, when engine warms ups misses worst. ghanged fuel filter and cleaned throttle body with solution spray. fuel pump pressure 45 lbs.
I have checked all the fuse boxes and found no blown ones. Also since the left side air bags were repaired the left rear power lock nor the power window will with the door closed. They do operate while the door is op...