My take.
Check your intake tube for cracks.
Excessive egr flow could mean a stuck open EGR. EGR open all the time is a big vacuum leak. Also the egr pipe can melt the harness at the back of the motor. Might check that.
MAF sensor. Make sure the connector is clean. Maybe clean the MAF.
Also check that there hasn't been a rodent building a nest in your air cleaner.
Check your intake tube for cracks.
Excessive egr flow could mean a stuck open EGR. EGR open all the time is a big vacuum leak. Also the egr pipe can melt the harness at the back of the motor. Might check that.
MAF sensor. Make sure the connector is clean. Maybe clean the MAF.
Also check that there hasn't been a rodent building a nest in your air cleaner.