Why does my car run rough when idle?

Tiny
BBOLDEN
  • MEMBER
  • 2004 CADILLAC SRX
  • 120,000 MILES
After approx. 30 mins of driving my car begins to run rough but only when I'm stopped. It also makes a rattling noise. Check engine light is not on. What could this be?
Thanks for your help
Tuesday, January 3rd, 2012 AT 12:23 AM

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