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Of course, it may make it run bad. However, I would be looking at plugs and wire and coil packs too. I had a 1998 Ford Expedition XLT (4.6L) It has the running ruff. I ran my computer codes. Bad O2 sensor. Running rich. It ended been two bad spark plugs. Therefore, I decide to do a full tune up. Wires & plugs. Everything was running like new after I was done. It took me four hrs to tune it up.

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16y ago

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