Initially wife said car was missing and idling rough. Change plugs, put in expensive dry gas x2 and brought it to KIA car dealer where i bought it used. they replaced plugs and said they were the wrong ones. (bill was greater than 200) It would still miss at highway speeds. took it to another mechanic and said it was something similar to the catalytic converter. Called Saturn and they said it was still under warranty. (2nd mechanic price was 150) took it to Saturn and they found the problem for 24 - it was the ignition coil of which they had a spare and found the problem. only trouble it cost about 300 to repair which my son put on. car runs great now but only a slight rough idle.