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    Flashing CEL - P0300 & P0421 - 2001 2.0 ES

    Looking for a little advice or ideas. I have a bone stock 2001 ES 2.0 and about two weeks ago I got a flashing CEL. Ran the code and got back a P0300 for a random misfire and P0421 for low cat threshold. After trying the things below I still get a flashing CEL about once every other day, so if...
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