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I know that black smoke/ running rich prob all to well... 1984 Cadillac has been at the shop for over a month with a guy tryin to figure out what's wrong with the throttle body.. it runs so rich that the plugs foul out every month or so.. so far he's changed everything and decided to go ahead and maybe throw out the throttle body and switch the 4.1 to a carb system. Hopefully that will do the trick.
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