New to the site and I apologize for any redundancy but have been unable to locate any threads related thus far...My 2014 roadster s turbo just started "sputtering" at high speeds (70ish-80ish) as if it's not getting gas or the turbo is misfiring. Use premium gas at all times and is not due for an oil change for another couple thousand miles and no dashboard lights are appearing. Thanks to all who respond!