A miss under load on a Focus is usually a bad or failing coil on one or more of the plugs.Also how old are the spark plugs?
If the misfire is bad enough it will show a code identifying the cylinder or cylinders misfiring.The coils are a weak spot and fail.
If you are keeping it,I would suggest new plugs and coils on all cylinders with boots and the miss should be gone for years.Get a set of coils with boots on ebay for $ savings.
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car was serviced wen i bought it 3 months ago, but did they put new plugs in i dont know. if i scan will it show a fault or not ??
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