I recently purchased a 2020 Shelby GT500 with only 139 miles from a dealer in Georgia. Since having the Shelby, I have had 2 check engine lights and 1 wrench light. I took the Shelby to the local dealer to determine, diagnose and fix the issues. The dealer informed me the codes were for misfires on cylinder 1 and could be related to full power runs. I have not pushed the Shelby to full power due to low miles on car. That dealer decided they did not want to pursue the problem any more due to lack of expertise and tools. They called another dealer and I took the Shelby to the new dealer for repair. The new dealer stated the misfires were diagnosed to cylinder 1 and could be due to bad gas. Their technician ran a litany of tests and determined the Shelby was in excellent shape with no issues. They did not replace any parts and said Shelby is ready for pickup. Any suggestions on causes and fixes.