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"Slightly lumpy idle"/no error code

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Old Apr 21, 2016 | 05:25 PM
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Default "Slightly lumpy idle"/no error code

No other way to explain it..especially in traffic when in gear. Bone stock 2011 GS/A6 with 22,000 miles. Chevron premium fuel..once engine is off idle runs great... no missing what so ever. Brought it to dealer last August when I purchased... They couldn't find any problem or codes(was under GM warranty). Had a 'similar 'idle with my 2000 C5 (stock)which I sold after 3 months ownership.... Any suggestions??
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Old Apr 21, 2016 | 05:33 PM
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Check for vacuum leaks.
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Old Apr 21, 2016 | 05:59 PM
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Some of these cars don't idle well. If there is an issue, I would be looking at the throttle body, MAF or injectors to see if it's time to clean them. I would also check the intake by the throttle body to see if there is oil inside.

Here is a thread that may help;

https://www.corvetteforum.com/forums...010-coupe.html
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Old Apr 21, 2016 | 08:26 PM
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Have you tried pulling the battery cable to reset the PCM fuel trims etc? (Needs to be off more than 4 hours.)
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Old Apr 22, 2016 | 06:50 AM
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It is perfectly normal. Mine does it too and nearly every one I've driven or ridden in. Some more than others. It's a performance engine not a Lexus.
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Old Apr 22, 2016 | 06:58 AM
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Originally Posted by Biggus Blockus
It is perfectly normal. Mine does it too and nearly every one I've driven or ridden in. Some more than others. It's a performance engine not a Lexus.
Nothing to worry about.
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