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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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I have a 1999 Cadillac deville concours and it has a rough

Customer Question

i have a 1999 Cadillac deville concours and it has a rough idle, when I put it into drive or reverse and apply the brake, it acts irraddically, idle jumping around. tThinking it is the egr valve, I disconnected it and no change . The check engine light did not come on when I disconnected it and had it idle. Bad EGR valve?
Submitted: 11 months ago.
Category: Cadillac
Expert:  Gm Tech (Cam) replied 11 months ago.

Good morning. I am Cam. Can I get your first name?

With your issue on your car, can you give me the history on it? How did it start, Did you get worse as you went or start up all at once?