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The car had a brand-new electronic fuel injection (EFI) system, a Holley Terminator X. It started fine cold. It idled fine. But under a hard, hot restart, it stumbled, coughed, and died. Marco swapped sensors, checked fuel pressure, chased grounds. Nothing.

Then he opened a feature called

Three months later, Marco tuned a twin-turbo LS-swapped BMW that three other shops had failed to get running right. Using , he drove the car for 20 minutes while the software adjusted the fuel map in real-time. The owner's face when he saw the smooth idle and perfect part-throttle cruise? Priceless. efianalytics