Sounds like a dirty fuel filter.
SOURCE: After driving for an hour
I had the same issues for most of last summer. Finally, I replaced the Plug Wires and the car has been working like a charm since. The other problem I found was that I had the wrong plugs. It seems there are only two types for the Focus, the local parts guys quoted me the incorrect part number and my fuel efficiency went to ****.
Bryan
SOURCE: 2002 Nissan Sentra Loses Power
SERVICE IT .....OIL PLUGS, AIR ,FUEL AND OIL FILTERS GET TROTTLE SENCOR AND THE MASS AIR FLOW SENCOR CHECKED
SOURCE: Why does my 91 VW Jetta stall out and lose power while driving?
I had a similar problem and the mechanic diagnosed it as a problem with the ignition coil. So you might want to get that checked.
SOURCE: Ford 460 loses power then dies. Starts back up. Idles fine.
It sounds like you might have a clogged catalatic converter on the exhaust system.
SOURCE: I have a vortec 350 setting a trouble code P1345,
p1345 is a crank/cam sensor correlation fault possibly due to a
failure in this solenoid.other possible causes include engine timing
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