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Yep,
You can spend a lot of money and change a lot of parts but not fix the problem on these cars. The money pit can get real deep, real fast.

A careful diagnosis starts with the symptoms, exact error codes, model, year, mileage, and any recent work done. Get your own code reader and pull the codes, write them down and report back here. Then we can walk you through the process. There are a lot of common problems and easy fixes but you will need the codes first.