lost need help

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    my truck runs great for about 4 miles down freeway then all hell breaks loose,
    fuel trim bank 2 gos to -20 to -27 loss of power ,spitting popping . I can play with peddle it kicks down a gear and takes off. gos a few hundred feet dose it again. I get off freeway it will start to run a little better zi dont get it.
    I have small exhaust leak can that be doing all this?

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