I've got a 96 GXE. It's my wife's car, so I only drive it occasionally.
Recently I noticed that, at freeway speeds, the transmission would kick
down a gear when going up just a slight grade, then drop back, then
kick down, etc. The RPM jumps to nearly 3500, so it might even be
dropping into passing gear.

There was no indication of the engine lugging. I thought maybe it
wasn't getting enough gas, so I changed the fuel filter. That seemed to
fix it, but I drove it again recently and it's back. (I didn't really
think it was going to be that simple, but it was time to change it
anyway.)

It doesn't seem like it's lost power, so I suspect it's something in
the transmission. My knowledge of transmissions is pretty limited,
though. I thought there might be a leak in the vacuum line or the
modulator, but it doesn't look like those concepts mean anything any
more...

Any one know what the problem might be?

davidbarron (AT) compuserve (DOT) com wrote:

It was a while ago, but I haven't seen it since I noticed the
transmission problem. (The readings were for the speedo not registering
intermittently, and one of the O2 sensors.) I was planning to check it
again this weekend.