I have a 2002 accord lx 5 speed 4 banger. I was driving and shifted into 5th and the pedal went to the floor. I pulled it back up and made it home having to pull the pedal up a few times. I thought the slave cylinder was shot so i replaced it. The problem is still there.

This is where it gets weird... I bled the crap out of the clutch and felt great. You turn on the car and grab a gear and it locks into gear and the pedal goes to the floor. But only when the car is running. Can anyone sense of that?
Does anyone think it might be the master cylinder or even the clutch it self?