Hey guys, My 2001 V6 mustang cylinder 4 spark plug has been repeatedly getting carbon fouled. I have changed that spark plug twice now in the past month due to it fouling out. Today I noticed car was hesitating/stumbling so I removed the cylinder 4 plug and sure enough it had a ton of carbon on it.…

Only one spark plug is getting carbon fouled?

Tester September 8, 2020, 1:45am 2

Try running a slightly hotter spark plug in that cylinder.

Tester