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I have a very rough idle on my Tbird on a cold startup and would appreciate any advice.

-The longer the car sits the worse the startup will be.

-After a few minutes of warm up time the problem goes away and the engine runs smooth with no issues.

- During the rough Idle period, I can apply the accellerator and the engine will run smooth. Take off the gas and it will go back to running rough till engine warms up.

-The problem seems to be getting gradually worse as the car gets older.

- No check engine light.

- The IAC is new.

I was thinking EGR valve or O2 sensor. Let me know if you can help.
 

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It is winter time so I would get a battery load test and check our your alternator too... Many places do it for free. I had a free one done at a Jiffy Lube on my Hyundai (winter beater) the other week... Call around for the free tests...
 
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