If the exhaust manifold gasket failed could this cause a lean jetting condition due to fresh air being drawn in by the reversion pulse through the exhaust pipe?
my guess is that it won't run lean becuase of it sucking air since it will be mostly under a positive pressure. Now whether or not it can runlean because you reversion pulse is escaping to the air I dont know, I just tend to think you could loose power since you are lessening the pulse.
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