Well, the Mystique made it to Winnipeg and back - but the light came
on again. This time it had a low activity code on the number 2 bank -
so I replaced the O2 sensor. Still getting the odd P0174 - at 750 RPM
and 0 MPH with IAT of 93+ degrees in closed loop (according to the
Intake gaskets have been replaced, PCV system checked(and new valve
installed), Bank #2 O2 sensor #1 replaced.
Car runs perfectly - including idle. There are no signs of a vacuum
Any good ideas?