has the 2.5, automatic. Only happens when i first start out on the gas, it sort of sputters lunges and pops, then it pushes through and won't happen again until it's parked and turned off for a few minutes. had suggestions of fuel filter and o2 sensor, i'm thinking maybe cat converter? anyone got a suggestion as to where to start? The jeep sat for about 4 years without running before I bought it a few months ago and got it running, if that matters.