2001 Ford Windstar getting P0300 Error Code

2001 FORD WINDSTAR
293,556 MILES
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GORDONB1221
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Replaced, Battery, Alternator, Cam Sensor, Crank Sensor, both O/2 Sensors on bank one, Spark Plugs, Ignition Wires, Coil Pack, and EGR, had tested the Vacuum Lines and PCV Valve. I do have a Diagnostic Device.
Jul 16, 2013 at 1:08 PM
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DOCFIXIT
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Have checked fuel pressure?
Jul 16, 2013 at 1:11 PM
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GORDONB1221
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Yes, I forgot that two weeks ago I replaced the Fuel Pump and fuel filter, five months ago I replaced the Air Filter
Jul 16, 2013 at 1:21 PM
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GORDONB1221
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I was getting a previous error code P0303 that is why I replaced the EGR, Coil, Spark Plugs, and wires.
Jul 16, 2013 at 1:23 PM
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DOCFIXIT
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Engine compression tested?
Jul 16, 2013 at 1:25 PM