Basically my stampede will fire 1 dart or 2 darts before the plunger tube (or whatever) starts to not move all the way forward. The problem could lie in this piece which popped out during modding and I can't find where it goes. But I think it's somewhere in the front barrel assembly. I've tested all of the wiring and it's all good, running off of a smaller 12v SLA battery. It has all the standard mods with a triple shot spring replacement.
Piece that popped out:
Video: