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The O2 sensor was brand new when I installed the AEM - so a couple thousand miles. AEM has an output to emulate the old single wire O2 sensor. It wouldn't be much trouble to swap back to the original sensor, but then I wouldn't see the mixture on the AEM.
I always used a dwell meter to read duty cycle.
When it's misbehaving it always goes lean. I'm pretty confident that everything on the ignition side is solid.
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1981 911 SC
2013 Mini Cooper JCW
2017 GMC K1500
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