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For the past month or so I noticed that if I floor the gas from a dead stop the there is no pick up in acceleration for a couple of seconds and then it accelerates slowwwwwwly. I have a 2001 ZX3 with Borla exhaust and Volant intake; no other modifications. This problem started a month ago and I have not done any modifications to cause this and no CEL. The engine seems to make enough power when cruising or passing but there is no acceleration from stop.
Could this be the fuel pump problem alot of people are having with their Foci?
 

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Another possibility is the O2 Sensor.
Mine had to be replaced, and the symptoms were primarily a choking/stumble at WOT below 1900RPM.
Less than WOT, or above 1900 RPM seemed fairly normal, but when it stumbled, it stumbled like it was OUT of gas.
 
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