Thanks to this list I got my westfalia running again. Severe bucking, stalling, would not start, yet would run fine sometimes for half hour or more then the malfunction would start and so on. Diagnosed to the digifant fuel injection system. decided to replace one part at the time and see if it was cured. 
First ignition wires, plugs, distributor cap and rotor, no cure.
Added injector cleaner to fuel, no cure
replaced all four injectors, still no cure.
added fuel water absorber to fuel, no cure.
replaced the fuel pressure regulator, no cure
replaced the the power relay, no cure
Fuel pump checked, good fuel pressure.
cannot get gareage to fix it since it only fails on the hyway.
Decided to replace ECU but cannot get one anywhere
Finally found one on this list, received it this morning from California, plugged it runs fine. Now I can leave for Michigan next week. My van is a 1986 camper 4 speed 2.1 bought new in 86, I have since logged 300k on it, replaced the engine and tranny at 200K and still going.  Thanks Jack