2000 XLS 4.0
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2000 XLS 4.0
JUST changed plugs - before, had sluggish response and rough running at/below 2000 RPM on freeway under load (uphill) with light whistle. Could let up on the pedal slightly and whistle stopped and run smooth. Two rear plugs on passenger side fouled a bit, others looked good. 
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fitzy67
1997 - 2006 Expedition & Navigator
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Oct 6, 2007 03:57 PM
