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Old 08-16-2001, 10:06 AM
sbourg sbourg is offline
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
The switch from Pt plugs should NOT make this big difference in mileage. I suspect there is some other underlying problem that caused the Pt plugs to eventually start misfiring, and you will again have the problem after the new plugs have accumulated some miles. Perhaps checking for error codes would be a good idea.

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