This car has a JZW Stage 1 tune, but the previous plugs were like this before that ECU went in last year. So this has been going on for some time.
Was thinking a vacuum leak might cause this but the hoses all seem OK and the car starts, idles and runs fine at all speeds, 27 mpg at 75-85 mph. And yes, I'm running the proper NGK plugs.
I'm thinking it's nothing to worry about, but curious--what do other people see with their plugs?
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