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I have a 2006 Chevy Cobalt Lt Auto and occasionally when sitting at a red light or a stop sign there is shaking coming from my engine. Its not enough to ever stall but the rpms do drop around 200 rpms.:sad:
 

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You know my balt did this for the first time the other day but it actually turned off but luckily I wasnt at a red light I was in a parking lot I have a feeling its a dirty throttle body
 

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Yep! If you are not getting a misfire code.
 

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I have cleaned mine and never threw a code.
 

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You just have to make sure key is out of the ignition when you clean the TB.
 
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