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Another item to check would be exhaust manifold gaskets. I checked mine yesterday and multiple bolts were finger tight. I believe this can cause a leak and induce additional air before the O2 sensors. In pair with this I am seeing a very erratic reading from the front o2s.
If you have access to a DTC scanner I would monitor fuel pressure at the rail during prime and idle, O2 sensor voltage during open loop, and long term fuel trims
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