Stonecoldchavez: Have you tried a tank of premium fuel? I didn't have this problem up until Feb/03 and I have owned and operated with 87 octane since Nov/99. Just give it a try and if it doesn't work, then move on to next possible resolution. I have read so many people with similar problems, but some resolutions work and some don't. Unless you want to take it into dealer, keep trying the easiest ones first!
Good Luck!