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So you spray a 150 shot after removing... lets say 9* of timing for example and the plug is still pig rich.. you would?

I think im gonna spray later in the year.... my car I just bought is wired up with a 3 stage retard system.. have no idea how to use it yet...

If it is rich, you remove fuel, or add nitrous, rich is not a timing issue. You CANT force a motor to burn more fuel than it needs by adding timing. If its rich, its rich.

Monte