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There are a lot of things wrong with this thread but the LM7 version of the 5.3 would benefit the most from a tuner such as Hypertech, Jet, Superchips, bullydog etc.
They offer performance and economy tuners sometimes on the same device. Other than that more information is needed. Is your truck a 4x4/ is it lifted? what after market items do you have? what has been done? what size tires do you have? do you know its current gearing?
For others to help in a reasonable manner you need to supply us with what you are working on. Good luck
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2002 S10 2wd p/u 139,000mi. *active*
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