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Our Shelby GT500 goes in low power mode when racing. When shifting from 1st to 2nd at high RPM's she falls on her face, then takes for ever for the throttle to open full again, loose about 20 mph. Short shift it and she runs fine, but much over and she gives a Spark Source, Fuel Source 16...

Last week my tuner starter tuning my 3.6LC along with the the other mods I've done, such as the 4 GT40 fuel pumps and 95 pound injectors using the stock computer. Last week he tune with the 4" upper and 10 over under with 93 octane fuel. He did great with the entire tune setting up the pumps and...