you can pull the o2 sensor and see if it runs better, (yes nasty exhaust leak but it lets it out if the cats clogged) or put a pressure tester in the exhaust to see if the cat is bad.
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you can pull the o2 sensor and see if it runs better, (yes nasty exhaust leak but it lets it out if the cats clogged) or put a pressure tester in the exhaust to see if the cat is bad.
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