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2001 Silverado 5.3L loss of power


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I have a 2001 Silverado z71 5.3L with 102,000 miles. The truck has a noticeable amount of power missing. On the slightest freeway incline I have to drop a gear to be able to maintain speed. I towed a 10' trailer with a truck bed on it(short bed) and the truck was really struggling. Off the line is not great either.

 

The truck has 37" tires but I do have it geared to 4.88 so it should not struggle at all. Anyways, I've replace the spark plugs/wires, fuel filter and nothing. Figured it was probably clogged cats so I just gutted the cats all together. There is absolutely no difference. I'm at a loss. Any ideas?

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