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Old 10-13-2012, 06:39 PM   #3
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What I Drive: 2008 Focus SES

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Originally Posted by Minchkin View Post
IIRC, the idle fluctualtion is the ECU trying to find the idle sweet spot. And AFAIK, all of the 2nd gen cars do it. It could be an engine mount going bad. How low is the RPM?
Thanks for the swift response!

It seems to drop a little below 500 rpm when fluctuating. I'll get some more exact number in a bit.

I'm going to grab some MAF sensor cleaner and 4 new plugs after work today.

Just had the oil and air filter changed.
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