Hi,

Any idea what would cause an oxygen sensor error (code 33) on a 93 max GXE,
just one year after the same sensor was replaced?  The current error code
and symptoms are identical to what it was doing before I replaced it last
year...It starts OK when you turn the key, but when driving it stumbles
badly on acceleration for several seconds and then suddenly kicks-in and
accelerates normally.  Then, when you come to a stop and then start again,
it does the same thing over again.

It ran fine for several months after I had replaced the O2 sensor last year,
but now the problem has returned.  It started out intermittent, but has
suddenly become almost constant again (just like last time).  Could this
possibly be due to using regular octane gasoline?  We have had the car for
about a year and a half and have been using regular the whole time.  The
manual seems to indicate that regular is OK for this engine (it's the SOHC
model).  Or, could it be from getting splashed with all the water on the
streets due to all the snow melting and making big puddles?  Not sure if
this is relevant, but the car has some intermittent electrical issues: on
very rare occasions, the power locks and power windows don't work, but then
a bit later they work OK.

Any ideas or help with determining the cause so that it won't happen again
would be greatly appreciated.

Thanks,
David