I agree with Bill...I would be suspicious of the afr readings themself. you may want to try another free-air calibration on the lc-1...
Just the same, a decent cam can make a wideband act all sorts of funny at idle...
I run a 3rd gen so thats all I can comment on, but I know typically its not recommended in my world to run the simulated narrowband output of the wideband into our ecm...
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87 iroc with the usual go fast stuff
heavier than your half ton.
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