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2007 Impreza 2.5i: RPM surges exactly three times when returning to idle


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Every time that I put in the clutch and shift to neutral, the rpm drops to idle, then surges to 1800rpm EXACTLY THREE TIMES before settling back to idle.

It happens every time.  Always three surges.

It was throwing a MAF code before I replaced the MAF sensor, but that didn't help.

I've also replaced the O2 sensor twice with no effect.  

No codes being thrown currently.

 

Thanks in advance

 

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