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I have a 1992 Cadillac Deville that is giving me problems. The cadillac dealership cannot find the problem. The car starts fine but once you get going it will starts jerking, misfiring and even rumbling, for no apparent reason. Can anyone help me, this car has been in more shops and no one can seem to give me an answer.
 

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1989 Sedan DeVille is now just a fond memory ....
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Preacher, first of all, welcome to the forums! :welcome:

Next, click on this link and follow the instructions on entering the self diagnostic mode of your car and come back and post any error codes that you see;

http://www.cadillacforums.com/forums/showthread.php?t=21558

By the way, this can be done with the engine running or off.
 
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