Originally posted by Rogerm60:

EGR Vacuum Regulator - Opens the EGR valve.


Throttle Position Sensor - From idle to WOT (wide open throttle).



Why would it be the EVR and TPS more than the DPFE?


'97 Mercury Mystique GS (Not mine anymore...) Now running a Toyota Matrix XR Red, 16" wheels, Sunroof, VVT-i