Originally posted by Rogerm60:

EGR Vacuum Regulator - Opens the EGR valve.


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



Thanx.

I'll look into those. You think more than the DPFE?

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