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Re: 2000 MX-5: Random misfires and P0420 code
I would first run a compression test just to be sure you have not burned some valves or a piston has a hole in it. Then do a wire and plug change then if the problem is not resolved then do the coil packs.
Then look at replacing the cat again
Let us know what you find to be the problem
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96 miata blk/blk 96 miata montego blue
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