Get your arms into the nooks and crannys of the air pipes past the MAF all the way to the Throttlbe body to check for a loose or broken pipe. You also stated that you are losing oil. it's possible that you're due for another PCV job and there could be a completely clogged tube below the intake manif...

Do a glove test on your PCV system.

Check to see if you have a clogged cat, burning all that oil is not good.