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Q: car has 250k miles running very rough and when it starts there is jingling noise on 2004 Cadillac SRX

never had tune up or timing chain done??
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jingle or rattle sound. poss. cat. conv.
rough running. review when last tuned up. it may be due.
rec. tune up every 50,000 miles.
rec. fuel system clean. ethanol treatment to 1 tank premium fuel.
rec. oil stabilizer treatment with next oil change.
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