[NitroNixon]

I think my adjustable fuel pressure regulator took a dump on me. Whenever I try to adjust the pressure, my guage will rise to 33lbs and stop at that setting, even if I keep turn the screw on the regulator, then when I turn the screw in the opposite direction the pressure goes down. When I try to turn the pressure back up, it won't go higher than 33lbs. And to make matters worse, this is with the vacuum off, so now I really don't know where my fuel pressure is set at, because I'm trying to decide if the gauge is bad or the adj. regulator is bad.

I do notice that after I tried to make the adjustments, my engine backfires when cold.