Pulled the shelby out 2 weeks ago from the winter storage. Ran the car every 2 weeks till proper operating temps while in the garage over the winter months. Last weekend went to Dasilvas show and shine. Car felt really sluggish off the line. Mind you the weather was killer hot and humid, but still didn't perform this way in the previous years. The only different thing I did was fill up with Shell gas insted of Sunoco. Don't know if I should throw octane boost or a fuel cleaning agent in the tank for improvements. If so could anyone recomend a good brand for car. Thanks