96SE, 104K miles was idling a bit rough, CEL came on. Replaced plugs (original!), reset PCM, light went off, but only temporarily. Car is definitely running smoother with the new plugs (Bosch Platinum). Could it be a bad O2 sensor? Where is the O2 sensor located, and how would you replace it? Yeh, I know I should get an OBDII scanner, but...thanks for any help.
