Check the various PCV valves on the car. There's a breather off of the driver side intake and one or two near the IM. They could be clogged, cracked, or disconnected.
Only other thing that comes to mind is crank position sensor, but it's odd that you wouldn't get random misfire or crank codes if that's the case.
Other possibilities include bad connectors on MAF sensors (i.e., sensors are fine, but the wires and plug could be bad) or cats may have inner elements clogged up -- unlikely, but that's all I can think of.
Good luck.
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