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According to ISTA your readings are within specs. You say it happens when hitting bumps, i would be chasing down wiring short. To do this i would start with the pedal position sensor wires. Run a jump wire from pedal to DME one at time to see if issue resolve, if it does you know the issue is with that wire.. You can run the jump outside for quicker diagnostics and then run a permit wire once you find which one it is..
I know lots of hacking but thats what i would do if i was in your postion.
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