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    Can't Get Rid of Engine Roughness - Ideas?

    Sorry for a late reply, but I had similar problem with my 04 EB Expedition. Actually same codes. I had P0303, P0306, P0174,P0357. I immediately changed #3 and #6 coils. Like you, Expy ran good for 3 Days then back to having P0303 code. Other codes cleared themselves. I metered the old original...
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