There were a couple of small erratic glitches that I could find with my Fluke 89-IV (I don't have my 97 anymore) while slowly sweeping up and down. I disassembled the sensor and found the coating on several of the tracks was flaking off (possibly from an enthusiastic throttle body cleaning). I cleaned the tracks, retensioned the follower arms, and re-assembled the sensor. My 4Runner is back to running well with the sensor plugged in. Thanks for the help.

'86 4Runner SR5 - 22R-EB with V-6 Throttlebody, 2" 4Crawler B.L., Ball Joint Spacers, Rock SliderZ, TJ Coils, 5.29's, Rear Locker, 33" Duratracs