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Sounds like a bad EPC solenoid or the wiring between it and the computer.
Possible causes:
--Open or short in harness.
--Resistance out of limit in solenoid.
--Damaged processor.
I looked that code up by a google search. Where is this Electronic Pressure Controler located? got pics? I am 200 miles from home, returning today, so I do not have my manual with me...
Where is this Electronic Pressure Controler located?
The EPC Solenoid is controlled buy the PCM Computer if it is a Gas van.
I am guessing you do have a gas van.
I am not sure where the PCM Computer is located in a 91 van.
1992-1995 it is just on the right side of center in the dash.
1988 is under the heater on the passenger side.
The EPC solenoid is located in the bottom of the transmission.