2005 Mazda Tribute 4-cylinder with 120K miles.
The PCV oil might of contaminated the O-seals on the intake gasket
The SUV runs good, but throws a P0171 30miles into the drive cycle.
I'am suspecting oil from the PCV system, I had to clean the throttle plate 3x during the 120k miles.
The Mazda shop wanted $115 for a smoke, mine was $1.49.
Got
http://www.Alldata.com ,and some new Intake gaskets today.
Yep! Intake gasket looks bad.