Car still sputters/shakes when idle.

2005 CADILLAC CTS
52,000 MILES
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TSTRONG6600
  • MEMBER
  • 2 POSTS
My car has been sputtering/shaking when it idles. The Cadillac dealer didn't find the problem. I noticed recently that it only happens when I have the A/C or heat running. Any suggestions?
Sep 28, 2012 at 12:07 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check fuel pressure shold be 55-60 psi and try cleaning throttle plate with choke cleaner on both sides. it's at the end of the air duct at engine. they get gummy and will cause rough idle and stalling. also check for a vacuum leak like a hose off. It can also bea cam fazer not working right but it shold set a code for that
Sep 28, 2012 at 12:56 AM
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