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My 2003 Zetec ZTW Wagon engine seems to be missing or skipping, or maybe its the transmission? Its an automatic, and when the engine is warm, and at cruising speed, say 40mph, trasmission is in Drive, RPM around 1600-1800, the ride feels like it skips. I'm thinking plug wires, but the skip feels rough. I've checked plugs - they look good. Any ideas?? I'll change fuel filter soon, as I have ran it dry(almost) a few times. I bottomed out pretty hard on a dirt road and maybe crushed something? When driving,if I engage the O/D button under the shifter, this changes ratio and RPM goes up, seems to get ride of the problem...but I don't wat to drive at 3000RPM everywhere.
I need your help if you have any answers[wrenchin]
 

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Could be your upstream O2 sensor. Mine went bad when i shorted it out on a hot header and I had the same problem. It ran smooth again once i replaced it and reset the ecu to clear the code.
 
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