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1985 BMW I535 starts but will not pick up power..like gas is not getting to anything.changed out fuel pump#2, changed filters, flushed fuel ejectors with cleaning additive, replace battery and starter. replaced fuel filter..I do not know what to do next. Will replace the pump inside of the tank..but wondering if this do not fix problem what else could it be. I cannot not go up past 30mph...and the engine is running strong. Any help will be appreciated.

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