spark plug colour-injectors ok
97 stock wrx, 200k
i had some rough idling, changed leads, the ngk ones had half the resistance, afm, plugs(made the most difference)
now 80% better
just wanted to know of they are running lean as i know the mixture is supposed to be slightly rich
photo is from front of the car
number 3 looks lean while number 2 seems rich
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