Had a miss on Cylinder 1 according to the scan tool. Bought all new plugs and Accel coils for the swap out. everything went good until the last plug. Drivers side, rear of motor. Wouldn't budge, soaked in PB Blaster, still no give. Noticed it had some cloth like material wrapped around the plug threads. Said to myself, WTF, shop changed the plugs last time. Figured they messed it up and didn't tell me. So left it alone, put the new coil on and will have my new shop check it when they do my clutch. Oh, and it runs much better, no miss,