AFM Disabler - Range Technology - Chevy / GMC engine saver - $150 (Glendale Lake Area)
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Range Technology AFM (automatic fuel management) disabler. Basically, it keeps the computer from deactivating cylinders when the engine is not under load. This helps keep the GM engines from blowing apart because of lifter failure (as they do)...
Anyway, you just plug it into the port under the dash and away you go. It is not VIN-specific so it works on a lot of different models including the 5.3 Silverado, Sierra, Tahoe, Yukon, etc. I used it on my Silverado for the short time I had it and it works great.
To find out if this particular one fits your truck, go here and search 'RA003B' then fill out your vehicle info on that page:
https://www.rangetechnology.com