What Larry and Dennis said.....

Plus you might consider just disconnecting the O2 sensor - get it out of
the circuit completely until you can deal with it more conveniently. The
engine will run fine without it. Your gas mileage may suffer a tiny bit.
After all, the O2 sensor provides the signal to the ECU which in turns
tunes the air/fuel mixture. Without the O2 sensor - the ECU  will go
into a default that is a little bit more on the rich side to protect the
engine.

John

On 1/5/2014 7:10 AM, Robert Clemmer wrote:
> Good Morning All,
>
>
>
> We just drove to Cape Coral, FL from Bucks Co. PA.  Somewhere around
> Richmond VA the engine started stumbling, bucking, or whatever you want to
> call it. It was like someone was doing Morse code on a kill switch for a
> brief moment.  The episodes started slowly then increase as the miles ran
> on.  It ran fine under full throttle.  It would only act up after you
> reached speed and eased off the throttle lightly.  Or when cruising after
> backing off the throttle lightly from cresting a hill or rise.  Didn't
> matter whether using your foot or cruise control on the throttle.
>
>
>
> About a 150 miles later we stopped for the night.  Next morning, started up
> and the stumbling started up again for about 50 or so miles then stopped for
> the remainder of the trip.  Two or three times you could feel it wanting to
> try when lightly coming off throttle at speed, but not to the point of the
> engine bucking and shaking the car.
>
>
>
> Weather conditions at the time were cold as in high teens.  Wet as in salt
> spray for the prior 250 miles.  Ice hanging off the bottom of the car.
>
>
>
> Prior to this event there was one very brief hiccup in July on a trip to
> Mackinac Island, MI.  Otherwise the car has been running flawlessly.
>
>
>
> Ironically, the same thing happened 20 years ago on a trip to Florida again.
> Same conditions, cold wet salt spray.  Stopped for the night and the next
> day the car was perfect until the ride back and back in the cold salt again
> around Baltimore.  Never did determine what the cause was. It just stopped
> and ran great for the next 20 or so years.
>
>
>
> I'm at a loss as to what the issue is.  Has anyone experienced these symptom
> before?  What did you do to solve the problem?  Is there something going on
> of imminent failure that will leave us on the side of the road.
>
>
>
> Any comments, suggestions, words of advice will be greatly appreciated
> before we turn back to the frozen north.
>
>
>
> Bob Clemmer
>