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2004 Ford Focus Rough idle when engine warm

Tiny
REVABRUNKER
  • MEMBER
  • 2004 FORD FOCUS
  • 2.0L
  • 4 CYL
  • AUTOMATIC
  • 220,000 MILES
My car idles roughly after driving for a little bit. Worse when stopped in drive. Also worse when ac is on. It seems to sputter slightly when driving sometimes. It was dying when I braked but replacing the PVC hose fixed that problem. But the rough idle has not been fixed. I have so far replaced the PVC hose, iac valve, catalytic converter, o2 sensors, mass airflow sensor, and coil pack.
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Friday, October 10th, 2014 AT 7:57 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
You have a misfire. None of the parts you mentioned will fix that. Start with the spark plugs and wires. If the problem is still there, consider performing a compression test, then check for worn lobes on the camshaft.
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Friday, October 10th, 2014 AT 10:18 PM

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