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Fouled Spark plug after fuel injector replacement

college man
college man

It sounds like the injectors were clogged up and not spraying with atomization which will cause what you were experiencing.
couple of options.#1 Take it to a shop and have them do an injector cleaning which will also clean up the valves and combustion
chamber.#2 Run your fuel tank to 1/2 or a little lower and try a fuel system cleaner which i would double dose. Then drive the car
hard on the highway Putting your foot into it and look for black smoke. You could also do a top end cleaning with a cleaner of your choice.
I would recommend the in tank and top end cleaning for sure.