Iv searched the threads and I have yet to find my answer. My truck will not go over 50 without making some sort of skipping noise.. And I can't figure out why it is doing it. Now I did just take the muffler off of it to change it bur have yet to put one on it.. It's basically a stock pipe coming off the catalytic converter, but I don't see how that could be the answer.. Can someone inform me on what's up with the poor girl?

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2001 Ford Ranger 4x4 6 cyl, 3.0 L, Automatic