(going to take a wild guess what your problem is... G_Johnny auto-attacking?)
Instead of setting the G_Johnny action tree on the player, set a different greaser style, such as G_Striker_A. Now instead of having the melee attack button do the G_Striker_A punch, have it do the G_Johnny combo (or whichever other move you prefer). Do this by repeatedly checking if button 6 is pressed, and when it is, set the desired action node on the player.