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Re: Manifold Question
I just changed the upper and lower intake gaskets in my M for the same reason, however, it didn't make a difference. I'm suspecting a dirty injector or two. I have heard that the earlier 3.5's had intake issues...not sure if it's true. I drive mostly highway miles and average about 25 mpg. 15.3 seems low. I would guess my car would average about 17-18 in the city. I suppose it depends on how you drive. I'm a lead foot and still maintain average fuel mileage
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