have a 2003 C5 corvette with a 6 speed manual. Car has a TSP 228r cam and tsp headers. I am having issues with it stalling on decel, as soon I let off the throttle the rpms dip way down past idle which sometimes results in the car stalling. I am looking for some assistance as I am interested in learning how to tune using hp tuners as it would be cheaper than having the car tuned again. The first tune was done by mail order tuner. I would rather buy a MPVi3 than pay for another tune. Any advice would be greatly appreciated. Do i need a wideband to tune effectively? If I post a data log could someone assist?