My 2005 tacoma has the PO171/174 Codes. Last year cleaning MAF and air filter made it go away. Now, have changed MAF and air filter, still have codes. Long fuel trim is way high on both banks, this is setting code. I either have a whopper vacuum leak or fuel pump issue. Has anyone had trouble with vacuum leaks on the 1GRFE? Intake gaskets, or throttle body gaskets?
Any suggestions will be greatly appreciated. Oh yeah, also changed PCV valve.