2004 Hyundai Accent Rough Idle

2004 HYUNDAI ACCENT
71,000 MILES • 4 CYL • FWD • AUTOMATIC
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KTYGRETT
  • MEMBER
  • 2 POSTS
Just installed new plugs, wires, pcv, FJ clean and still have a rough idle problem when I come to a stop. When I release the brake the rough subsides. What's the ans please thank you.
Nov 18, 2009 at 1:50 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Hi ktygrett,

Thank you for the donation.

If the engine is surging when the brake pedal is depressed, the cause is a leaking vacumn from the brake booster. Check the master cylinder to booster sealing/O ring for leakages.
Nov 19, 2009 at 7:02 AM
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