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:ditto:K&N filters flow so well 'cause they don't filter! If you run in dirt for any length of time, stay away from them.

Why? Ever done it?

A wet air filter element will cause issues too, better check it! On mid-80's to mid-90's pickup diesels, white with lack of power meant a clogged fuel filter. A bunch of restriction will actually cause an air in fuel symptom. The fuel will be pulled apart as it is passed through the filter...

_Black, not quite enouge air to complete the combustion process...the black is soot, excessive black anyway, the multi's like to run that way:wink: _White, smelling of fuel, Correct amount of air, just an incomplete burn usually due to cold cylinder temps or timing...kinda the same as black, but...