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Sorry Karl, I received no email from you and had no idea you'd changed manifolds....Question, how do you know the replacement manifold is any better than the one it replaced? They blow out internally where you can't see. The 'fix' is to plug the heat riser hole each side, sure, that eliminates the heat riser, but certainly prevents contaminated inlet charge. Like you, I chased this problem for months, didn't want to accept that the heat riser had blown, so convinced was I that it was electrical