Engines went to full power, uncommanded on takeoff.
It could be that "APR" activated, which needs to be armed in the CRJ-100/-200. If so, the power actually went about 500 pounds thrust over normal takeoff.
This is electrically activated.
When it senses a lack of thrust on the opposite engine (don't remember the parameters), that's when APR is supposed to kick in.
Fuel controller on CRJ-100, -200 is a cable that could jam, but having two do that at once seems unlikely. I'm guessing APR.