I was about to post a very simular problem. My 1999 always SPUTTERS, and some times stauls out! I change oil faithfully, and I believe they changed my plugs before I baught it 4 or 5 months ago. I don't have any type of leak, atleast nothing visable. I noticed my car even does it at every stop light as well. I don't mash down the gas pedal or anything, I baby my ride.
So yeah, I am wondering what is wrong with this POS?