Since you did something to the air cleaner, check the plug for the air mass sensor - see that all the female pins are lined up.
Sometimes one of the pins gets pushed out of posoition - If one or more pins are recessed, carefully pull the wire out and gently bend the tang that licks it in the plug.
When I had that issue in one of my 740s, I pulled the rubber boot back abd drew a Sharpie Marler across all the wires so that I could check for contact after the sensor was plugged in.
Long shot, nbut easy to check.
The connection on the air mass sensor is one of the few connectors that is messed woth on a regular basis.
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