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Cadillac
DeVille Concours
Engine
Symptoms
Idle Rough
1998 CADILLAC DEVILLE CONCOURS
61,000 MILES
ANONYMOUS
MEMBER
1 POST
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P0300 slightly rough idle long term fuel trim high bank 2. Any help would be appreciated
Dec 17, 2012 at 4:10 PM
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HMAC300
CERTIFIED EXPERT
48,601 POSTS
check fuel pressure first shold be 48-55 psi.
Dec 17, 2012 at 4:13 PM