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Hello, To correct this concern you want to get a can of CRC mass air flow cleaner. You remove the mass air flow and spray it very good with the cleaner. Let it air dry and reinstall into the ve3hicle. Have the battery cables disconnected for 10-20minutes. This will reset all memories inside the PCM Test drive the vehicle and your concern will be fixed. Overtime the mass air sensor needs to be cleaned from all of the dust that builds up on it.
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Has the idle been rough the entire time? If you tip into the throttle does the vehicle run smoother off of idle?
On the passenger side valve cover I would carefully inspect the PCV valve for it being cracked and broken.