I originally asked the question about the O2 sensors today and how my crappy
idle and hesitation disappeared when I disconnected my O2 sensor.  Well
today I took it upon myself to replace the O2 sensor and low and
behold......the new one makes it run WORSE.  The idle stumbles really bad.
When I coast to a stop with the clutch pressed in the van almost stalls (ie
all the leds come on on the dash) but keep running really rough. I noticed
while coasting to a stop the tach drops really fast all the way down to
~400RPM and settles around 750-800RPM with the sensor connected.  When
coasting to a stop with the O2 sensor disconnected the tach drops slower and
settles smoothly at 1000RPM. Any suggestions what I should do now????????
Will my fuel mileage go to hell if I drive with no sensor?????
thanks,
Chad 85GL