2001 Mazda B3000 Q&A

2001 Mazda B3000 Question: Running a bit rough. Doesn't stall, but when stepping on the gas it will sputter

Check engine light comes on. Got that checked. Code meant a problem with #3 cylinder. Replaced that spark plug and got a new set of wires put in. Yet the sputtering remains. Not sure what to try next. Even check the air in-flow and it looks clean. What do you think? -
Answer 1
What did the spark plug that you replaced look like? That info would help point a direction , if indeed it was a problem (presume DTC P0303). -
Comment 1
The spark plug looked used\ slightly blacken. -
Answer 2
possible injector? -