The AFM can (and should, if you wish to enjoy your truck for any length of time) be disabled. You can have it tuned out with a full tune (which I would recommend, for example @BlackBearPerf), or you can buy a device such as Range to disable AFM. Alternatively, you can drive it in 5th gear each time you start it up, to prevent it from using AFM. And of course the best option, to physically change the hardware, removing the weak links, and replacing with standard lifters, etc.. via a kit.You said”Another weak spot in the drive-train is the engine's Active Fuel Management (AFM)/Displacement on Demand (DOD) system. It shuts off four of the eight cylinders under low load conditions. The problem is crudding up of the control system. You can do a search on the Forum for information for your engine and model year range.”
I must tell you I’m in California. Correct me if I’m wrong but you can insert a chip to disable the AFM. No matter how it’s done I’m under the impression that in California this is illegal. It’s due to the fact that disabling the AFM affects the emissions on the vehicle and if you live or have lived in California you know this is a big deal. However I’m told that when your registration renewal comes and smog
Checks are down each year you just pull the chip. Prior to inspection. Bear in mind I’m getting my info at the water cooler but trying to learn along the way.