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Change the oil too, that makes a surprisingly large difference, especially on hydrocarbons
Does it sit a lot? If it is just used for runs to the Piggly Wiggly, or to cars and coffee deals hunting pedestrians, but at low speeds, it will tend to gum Take it out on the freeway, or run it in a lower gear to get the cat hot. My understanding it that burns stuff off the catalyst. Italian tune up in the vernacular.
I like that soap and water wash it out thing Scotty does in that video.
Bad oxygen sensor can make it throw a cat code too
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