Scotty, my 2000 Chevy Blazer threw a MIL light for a MAF sensor too low about 6 months ago. Thankfully I bought my own Innova 3160. Six months ago, I pulled a P0102 MAF sensor low. So I removed it, used MAF cleaner and sprayed it. Letting it dry for 30 minutes, I reinstalled it. THAT unit worked well for about a week, then the same P0102 code came back on. I also own a donor vehicle (1998 Chevy S-10 p/u with the same 4.3 V6). 5 months ago, I removed that MAF, sprayed it, and installed it. It cleared the MIL light until yesterday while driving back from Laguna Beach, CA. While there are no adverse effects (shuddering, stalling), I ran a diagnostics and it indicated the same P0102 code. Both MAF units are genuine AC Delco or Remy parts. The vehicle has 198,151 miles. It "runs like a clock" (as you say), still shifts "like a dream", naturally leaks oil from the rear main oil seal onto a catalyst converter at the "y", and the only hands that work on it are mine. I purchased it from a family member in 2009, and that member was the original owner. The ONLY thing done to it is a K&N cold filter kit, but I do have all of the original parts. The only modification here is that the kit has been on for well over 7 years. A short list of repairs:

AC Delco Spider injector replacement with AC Delco MPI injectors over 8 years ago; AC Delco intake manifold gaskets developed a coolant leak, replaced with FRAM intake gaskets; new AC Delco iridium plugs replacement of AC Delco double platinum plugs, AC Delco fuel pump replacement with an Autozone lifetime pump; MSD heavy duty wires, and an AC Delco Cap and Rotor set. 

As you can see most everything replacement is by way of factory parts. I tried to go in as much detail. If there's something that I missed, fill free to reply. 

Thanks,

Erik