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I agree that you need to find a competent shop. Have you had a shop hook up a scan tool (OBD) to monitor what is going on? Is there a service engine lamp lit on the dash?
These cars are pretty technical. When they run correctly they are a dream to drive. When you have problems, you need a competent shop.
AutoZone will do a scan for you and tell you if you have any codes stored. That is a start. Nose around to see if you can also get the inside line on a competent GM dealer (preferrably a Cadillac dealer) as these Aurora's shared alot of diagnostics with Cadillac. Hope you find your problem.
Regards,
Fred
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