Looking at this chart..
O2 Volts to A/F ratio
volts ............................. A/F
0.1 ............................... 17
0.2 ............................... 16.5
0.3 ............................... 16
0.4 ............................... 15.4
0.5 ............................... 14.9
0.6 ............................... 14.4
0.7 ............................... 13.8
0.8 ............................... 13.2
0.9 ............................... 12.7
0.985 ............................ 12.1and your O2 Sensor Voltage Graph.., The left O2 is sniffing ~13.5 AFR.. the Right O2 is sniffing ~17.. If your O2's are cycling at a normal rate at High Idle ( You said they do ), then you are not having a balanced air flow to each bank when the T-Bodies are at 'Closed' Position.. When I have seen this on my NA's, I will CLOSE the LEFT T-Body to Richen up ( Give less air too..) the Right O2 Sensor.. if you can not get the Left T-Body to close, then Open up the Right T Body ( To lean out the Left O2 Sensor ) then close the Idle Air Controller to get the Idle Speed back down.. It's a balancing act trying to match the air, Mixture, and Idle Speed.. I do this test/Adjustment before my NA's get California Smog.. pass.. I'm not thinking it's pinched O-Rings.. as your fuel pressure holds for a while.. I've had on of my NA's hold fuel pressure for 2 weeks!.. Don't know how much it was, but it squirted a bunch.. scared me, as I was not expecting it.. It does not hold that long anymore.. I get about 10 hours before that one goes to zero.. Not sure what changed.. Good Luck.. Cj
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