So my tire pressure was a little low (still rideable) and i went to put more air in it. I have both a plug in inflator and a hand pump. The second i connected the pump to the valve, the tire instantly deflated and wont take air now. Its a presta valve with a schrader adapter on it. If i hold the handle down on the floor pump, itll feel like air is in there, and the second i pull the handle up, its completely deflated again. Any ideas? Shouldnt have anything to do with a hole, seeing as how it was just a little low for a few weeks (but holding at that pressure) use this as my daily commuter to work, and now im back to walking. Any help would be appreciated