Tried that...added enough to treat 20 Gal, drove several miles; no
difference.

"el Diablo" > wrote in message
...
>
> "THX 1138" > wrote in message
> news:dKlxd.213789$5K2.10116@attbi_s03...
>> -Last night, filled tank in 2000 Sephia with no previous signs of
>> malfuntion. Drove home and parked it for about an hour.
>>
>> -Upon ignition, engine sputtered, but idled OK. During acceleration, ran
>> very rough. After about three blocks, turned around and drove the trusty
>> Volvo for 20 mile trip instead.
>>
>> -This morning, drove Kia about 2 miles to buy new fuel filter. On the
> way,
>> noted that sputter occured in mid-throttle. Replaced filter, and
> restarted.
>>
>> -Let idle for several minutes and increased throttle. Sputtering still
>> occuring.
>>
>> -Car has 52K miles. Bosch plugs and K&N filter only a few months old.
>>
>>
>> What next?
>>
>>
>
> You might want to try gas additives like "Heet" to dry any potential
> moisture in the fuel. It sounds as though your problems started after
> getting a fill up on gas.
>
> Brian
>
>