Perhaps the kickdown switch behind the gas pedal is stuck down? Happened in my w126 diesel, though it made it rev high through all the gears

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth