I'm having an issue with my 05 GT going in to the " Engine Fail Safe Mode" when I jump on it and run her hard? the car will only go about 5 Mph and when I shut the Motor off and start it up again it will run OK? I put my Code reader on it and it said it Passed with No Codes? How is this possible? there has to be a reason why this happens. It sucks having to drive my car and Not have any fun. Does, anybody have an idea what the problem may be? I only have minor after market Hi-Perf parts BBK Throttle Body, C&L Intake W/ Tune, MSD Coils and BBK under drive pulleys and all of these parts have been on for years with No issues until recently.