DIY smoke test to rule out any unmetered air leaks on air Intake system.
$150 Professional Test-
www.youtube.com/watch?v=FfiQ7qWiG-M
$1.50 Shade Tree Test -
www.youtube.com/watch?v=zMok2y05jNE , try using plastic wrap around the air filter to block all air incoming to the Intake, PCV hose to blow smoke, Black & mild cigar, and favorite beer for better results. Put your thumb over PCV tube in between puffs of smoke.
Lynyrd Skynyrd ''That smell''
www.youtube.com/watch?v=hQlCxE4z3u4
Focus on the EGR, PCV, and Air intake system for any smoke leaks, because of bad plastic, rubber, gaskets, and seals.