90% of fuel problems are electrical.
You have a loose wire, possibly a ground wire that is losing contact.
The big bumps make it go off suddenly and back on again.
To simulate this idle the engine in neutral.
Check every wire and harness and manipulate them in many directions.
It will be obvious when you find it.
I would start in at the kill switch.
Next, check the battery cables.
Then check the big bus connector to the engine.
If you are still looking st this point you may need to wear a head lamp and go spelunking!
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