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this sounds like a bad electrical connection thats making and breaking when you pass over bumps
As you have a code for TPS related issues I'd next carefully inspect the connections to the pedal and the wiring runnign to it
disconnect the pedal and clean the pins with some switch cleaner 1st and then trace the wire back into the main loom , checking for chafed insulation and hard sections of wire
I'd also check over the ECU power supply relay and fuses for signs of corrosion and possible cracks
if this is all OK I'd check over the battery connections for tightness and corroded connections
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