It is possible that turning up the fuel has made things worse, since excessive soot can crud up the rings and make them not seal as well. If you are getting a lot of black smoke, you might want to turn the fuel down and clean it up a bit. The soot doesn't give you any additional power, and the extra particulate matter inside the cylinders makes rings and bores wear out faster.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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