Which fuel pressure regulator did you change, the primary or the secndary? Did this problem come on all of a sudden or was it gradual? I had to adjust mine but was lucky enough to have a exhaust gas analyzer at a friends shop. The same symptons occured a year later when there was a dead cell in my battery. I could start it but only had 12 volts at a fast idle, swapped batteries and it ran great with 14 volts.
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