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| Message: | My father has a 1991 420sel with a new valve job, the car recently blows like thick black smoke. no not diesel I already asked him that. and there is some black junk driping fast out the exhaust also. it starts right up but when given the gas it has no power and has a shimmy to it. his mechanic said he knew the problem last year and kept the car for a whole year without fixing it, so my father had it towed back to his house. is there a quick fix like the mechanic said? please let me know. thanks | ||||