this is my moms car...the car is an 04 stock and its sputtering at low rpms in last gear around 1400-2000rpm changed spark plugs,seafoamed,cleaned throttle,and replaced bad 02sensor it still sputters ive read there is no fuel filter so any suggestions?

 

information...
V-6 vs. 4-cyl engine are very different
USA version of the car? There might be fuel filters elsewhere in the world.

 

4cyl vtec and usa made