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WOW! 215K on plugs??? Are you sure no one replaced them before??? I would do plug wires, and

do a good inspection on the Throttle body,for gum coking, check the egr valve, and check for codes

in PCM. I would also check the coils for primary and secondary resistence if you even went half that mileage

on plugs! Thats very hard on the coils when gaps open up from lack of maintence. Did you check your fuel PSi

may need a filter.its in he tank but they do clog up after 200K. Do a complete tune up first. With mileage do plug wires.

first foremost then check the ThrottleBody and Check for Codes.

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