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Then one day after going down the interstate (8 miles) I lost the ability to idle once I let go of the throttle on the deceleration ramp. Has not idled since.
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This sounds like an EGR valve stuck open.
There is a vent port on the EGR solenoid the people think should have a hose or cap on. It should be left open. Unplug the hose to the EGR valve and see if it moves to the closed position.
Here is information from an earlier thread on the same topic:
One nipple on the EGR solenoid should not have a vacuum line connected to it, because it is a vent. The earlier trucks had a sponge like filter on the vent nipple. It is fairly common to see the filter missing on older vehicles.
On the EGR solenoid, as the solenoid is de-energized (vacuum supply cut to EGR), vacuum would be trapped in the EGR if it were not for the vent passage, to let air in. As the EGR diaphragm moves, when the EGR valve is closing, air is drawn in through the vent.