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2024 Mustang Dark Horse — Whipple Stage 1, 10R80 — Persistent flutter/stutter + downshift clunk. Anyone seen this? (Taking it to Ford next week)
The car: 2024 Dark Horse, Whipple Stage 1 (Ford-warrantied), 10R80 automatic, 11k miles, transmission/converter original and unmodified. Whipple's dual air intake system is part of the kit. The symptom: Flutter/stutter under load at constant RPM and speed — initially most noticeable around...- SC Dark Horse
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- Forum: Dark Horse Mustang