Sorry, it's a Nissan Sunny 1992 petrol ignition
> What does it means that a fine black powder builds up fast on my plugs and
> what should I do ? Thanks in advance
> What does it means that a fine black powder builds up fast on my plugs
It's rich or you have the wrong plugs in it.
> and
> what should I do ?
Lean it out or install the right plugs.

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Steve
http://www.atlantaracing.com