a 97 Accord in my shop is doing this same thing. I can't get it to reproduce though. It did it twice under my possession. I thought it was wierd that it started after pumping the throttle.
In fact, someone who was standing there, stupidly said "Did you pump it?" and we all laughed. He went on and on about pumping the pedal, so I did it to shut him up. Egg on my f*ckin face.