this is my girlfriends car and yesterday i was driving and while pressing in the gas past a certain point the engine rumbles and doesn't accelerate. i have to let off the gas a little to get it to stop and than just baby it. I put mid grade gas instead of cheap gas to see if it was the problem drove around for 20 min and no improvement. My next move was to change the fuel filter since it probably hasn't been changed since it left the manufacturer. The problem is i dont know where the fuel filter is. Can someone post a picture or diagram of where it is and what it looks like. Or can someone diagnose this problem and tell me if its something else, thanks.