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Discussion Starter #1
I have a 2012 Cruze 1.4 I have a repetitive rpm dip at idle about every 4 seconds or so where the rpm will drop 100 rpm or so then recover and go back to normal then do it again over and over. I've had it for months and haven't had any other idle issues along with it so I haven't bothered trying to repair it but I figured I want my car to run the best it can. Any idea what things could cause this?
 

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Discussion Starter #3
I've never used anything but premium gas(93 octane) for the entire history of the car since I've owned it for the last year.Again this dip in rpm is extremely repetitive and you could time a song to it as it always occurs about every 4 seconds so does anyone reading this know of things that could cause a repetitive drop in idle every 4 seconds?Anything would help me.Thanks.
 

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IAC or the compressor for AC/defrost cycling in and out and bogging down the motor.
 
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