Week plus into it and no stuck throttle or abnormal engine noises despite temps into the teens, so I guess the new cable fixed it.

Couple other fixes went in around the same time. Had the temperature gauge over-shoot problem for last 1.5 years. This issue developed after a new radiator was installed. Was running a oem toyota thermostat that worked perfectly before the new rad went in. Based on forum search, there seems to be a relationship between cooling system servicing and this overshoot problem developing, but I don't know what it is. The two-stage thermostat ($40) fixed it.

The next fix was to the shifter seat bushing, replaced with Marlin parts. Shifts like new now whereas before the fix 3rd and 4th were grind city, and 5th would pop right out. Unfortunately, disassembling the shifter required 1.5 hrs of professional mechanic labor. The old rubber bushing disintegrated and prevented the lock ring from pushing down far enough to be removed.

In the end, a few relatively simple and inexpensive fixes allow me to keep my truck on the road for the foreseeable future. This forum is a great resource.