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I've a '03 MSP that anywhere from jerks violently to shudders just a little, to no jerking or shuddering at all sometimes. It's always between 2500 and 3100 RPM, but sometimes only between 2900 and 3100 or so. It's not the WGA, it's not a vaccuum leak (had both tested at a shop), and no Check...

The owner before me replaced my MSP's stock exhaust with a straight-pipe no-cat exhaust with a flowmaster muffler. In addition to the extremely loud drone and exhaust note that I don't particularly like, the exhaust love to belch that black soot, which gets all over the rear bumper every time I...