Try filling it up with good gas and run a tank of gas thru it.
Carl
My 93 taurus is acting up. Running real rough, surging. Scan codes
> come back as 172 and 176 which indicates neither front or back o2
> sensors are switching. Both are relatively new. Only a few k on it.
> Front is about 30k old.
> I did a bench test of front one with propane torch. Shows normal. Back
> one much harder to get out so I haven't checked it yet. But I doubt it
> would be a problem because it's "new". Other than a bad sensor anyone
> think of other possible causes for these codes.
>
> Car just went through inspection in February. I did have a bad battery
> problem where the car sat for several weeks. Seemed that when I got it
> back on line was when I first noticed idle problem. At first I thought
> it was water in the gas so I put a bunch of water out and injector
> cleaners through the system to no avail.
>
> Any ideas would be appreciated.
>
> Thanks
> JerseyJim