Dirty Ignition coil = cause for concern?

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2003 Protege 5
Hey all..

I purchased my P5 earlier this month and have had consistent engine code errors. Its the P0300 (I believe) - random cylinder misfire. The check engine light will come and go every few days.

Per the suggestions on another thread, I replaced the spark plugs & wires, and installed 2 new coil packs this afternoon. One of the coils came out dirty, while the other was spotless. Is this cause for concern?

P5%20003.jpg


P5%20004.jpg


(Despite the picture, the bottom end of the coil was covered in sediment. I wiped it off a bit to get a closer look)
 

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