2003 Infiniti I35 Cold Crank Car Rough Idle Doesn T Smooth Idle Morning

2003 INFINITI I35
180,000 MILES
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Cold crank car has a rough idle. The car doesn't have its smooth idle in the morning anymore. Taken to shop, but they seem to can't find the problem.
Oct 17, 2012 at 10:01 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
If the cold start rpm is low it could be due to various reasons.
Do you have coolant losses or overheating issues?
Are there any trouble codes?
After warming up, what is the idling speed and does it change when A/C is turned on?
Are there any performance and driveability issues?

Try cleaning the IAC and throttle body for a start.
Oct 17, 2012 at 3:00 PM
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