What could cause sputtering when accellerating

The first thing I would check is to make sure you have good fuel pressure. Think about it, when does the engine need the most fuel? When taking off and going up hills. If you need directions, check out the homepage under the DIY section. There is both a video and directions on checking it. I feel you'll find that it is below the manufacturer's recommendations. KEEP IN MIND. If the pressure is low, it could be a partially plugged fuel filter too. They are much easier and cheaper to replace.