nothin really internally wise...shit just has bad gas mileage. it got better...with the new fuel pump/filter. i got a mx6gt FPR on it, but that hasnt relaly hurt the mileage only had it on for a week or so. but it does run really rich, just shoots out flames all the time. Its throwin 15 - 17 code now..15 - o2 sensor gone bad, and 17 - rich or lean condition. So once i get the o2 sensor, i can see if its still has a fuel prblem.. but the mileages isnt that bad...im just exagerating..