Lack of power w/ 1993 5.7 liter Silverado

I have a 1993 Silverado K1500 short bed, step side with a 5.7 liter TBI and automatic transmission. I recently rode to lunch in a co-worker's 2002 Tahoe w/5.3 liter. The Tahoe had what felt like twice the power of my
pickup!
I understand that old age is a serious factor, but why would it make that much of a difference?
I change my oil, plugs, filters, other fluids regularly and run good quality gas. It just seems gutless in comparison to that guy's Tahoe!
Any suggestions? I'm NOT buying a new truck, so skip that one. I'm almost done paying this one off, and I want to keep it that way! :)
I've had other people suggest that my muffler or catylitic converter could be clogged, since it's all original (I live in Arizona).
Thanks -Derek
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I had the same problem with my 92 . I thought it might just be that I was used to driving it, but over time it got so sluggish so slowly that I guess I didn't notice. Anyway I finally dropped it off with the mechanic for the weekend so he could drive it. They ended up changing one of the injectors. I had cked them myself and didn't see anything wrong but they said every once in a while they would get only 1-2 a spray pattern. Well hell when I got it back I thought They dropped a new engine in it. Ran like the first day I layed rubber out of the dealership.
That was a few years ago and well I think I am in the same boat again now an maybe I will change the other injector, I can barely spin the tires going uphill on a rainy day.
Good Luck JRE
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