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Pete
Did you ever find resolution to these inappropriate AFR values under load? I have the same 089 in a 3.0 ROW. I experience the lean you described in first posts here. I suspect the vacuum routing is wrong.
I’ve searched an and found many different potential diagrams but not one that says Yes! This is 089 vacuum routing for non lambda
It was routed top of WUR to upper throttle body nipple on drivers side (1)
Lower chamber to thermotime and from there to T at decel valve to front of car nipple(3)
(1) has no vacuum appears to be atmospheric
(2) nipple, just below 1 on the drivers appears to be true manifold vacuum as it pulls vacuum at idle and drops with throttle
(3) pulls vacuum at idle and under throttle
(4) goes to my distrib and I’m guessing is doing fine
As the car generally runs great
Do you have a diagram that worked for you and gave you STRONG enrichment at WOT. The best for me is shutting off the vacuum to the lower port of the WUR which gives me rock steady AFR At whatever I set enrichment to
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