Those TBI's were known for sucking in the base gasket and causing a vacuum leak. But usually it would cause fast idle, and not be intermittent. There would be a whistling sound, louder than normal air intake.
Might try unplugging the EGR hose, go for a test drive. Not sure how it gets the vacuum signal, could be in the signal or the valve getting weak.
I hate parts guessing, but has the coil been replaced? Sometimes they short internally, give intermittent weak spark. Get it in the dark, use insulated wire puller pliers, slowly pull the coil wire out of the distributor, look and listen for the coil to start arcing and the engine faltering.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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