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RE: My 99 dohc just threw a P0304 code. Any thoughts?
Ireplaced the intake manifold gasket today. Idle is perfect andpower isback. I have a feeling it's been leaking for awhileuntil itfinally got bad enough to cause a misfire. New gasket material issuperior tothe crappy oem gasket. A bit of a pain to do but at least the problem is solved.