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Re: I have a 2005 ford focus 2.0L it has a mis at idle...
Are you sure it is a miss or a vibration? Focuses are famous for a vibration at idle because of the upper motor mounts. some get so bad that the whole dash vibrates at stop lights.
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have the check engine light checked at a parts store its usuall free. I would bet its the idle air control motor. This controls the fuel air mixture at idle
since this is a standard and you need to engage the clutch which basically shifts you into neutral to shift gears, this ALMOST sounds like the idle air control valve.
It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.
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