I just bought this 2005 Corvette and drove it home 700 miles. During the trip The speedo would become very erratic at times which in turn was causing the transmission to shift very erratic. It seemed to be the worst after just stopping to get gas or get something to eat. It would sometimes but not always become stable after 60+ miles of driving but sometimes it would never get any better and drive me crazy until the next fill up. The car was tuned with HP Tuners and I have all the software and licensing and have since made a backup copy of the current tune in case I start making changes I can always restore it from disk. Is there any possibility that there's some setting under HP Tuners in the Speedometer section that could be causing this to happen or is my VSS in the differential just going bad? I do have a receipt showing that the VSS was replaced a few years ago. I'm new to HP Tuners but I work on computers for a living so with some help I can figure it out. Thanks for any help.