I experienced one low-speed RTO probably 25 years ago in my jump-seat days. One engine failed to wind up as throttle was advanced. We cleared the RW and taxied back, turned on bleeds for the second attempt, and that did the trick.
Funny but the FE had the notion that bleeding the fuel line (solenoid controlled from the overhead panel) would clear the hangup. I had a long talk with him, explained that it was an aero problem in the compressor, not a fuel problem...
