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Since no one has any suggestions, I'll give it a shot.
First, your 02 sensor is supposed to flip back and forth quickly in closed loop mode, so I doubt thats your problem.
Have you pressure tested the intake? Given the age of the car, it probably has leaks, and that won't help your emissions. It would also explain your hesitation. I'd vacuum test your FPR, fuel damper, and bypass valve as well if you can.
The other thing to check, since you're high on all the measurements, is whether you're getting misfires. Do you have the good copper plugs with good wires and a good cap and rotor?
-Ian
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Stock 1988 951, TT aero wipers
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