A number of dealers and shops have performed code checks to no avail. I have examined all sensors I can using VOM and a scope but the Crankshaft Position Sensor was the only weak item. The flex plate on most Dodge V8s have about .010" of runout and the weak original CPS was missing some windows so two or three cylinders would get no fuel and no spark. Chrysler finally redesigned the sensor recently and the new model, which is solid plastic on the working nose, will detect a window from as far as 0.150 inches away. This made a huge improvement in power, mileage and smoothness.
On a recent long trip gas mileage was down in the 14s and I had a long way to go so pulled all the PCM connectors and rebent all the socket’s spring contacts to give better grip. Mileage jumped to 17.5 and car ran smoother, started on the first cylinder and had better power. Still a weak cylinder there somewhere and the lean misfire under light load.