Too far forward in your stance
Q: I know it is hard to tell a person the reason their ball is doing what it is doing without seeing them hit in person but my question is what might be making me pull hook a ball off the tee. Could I possibly be playing the ball to far forward in my stance?
A: YES or you could be stopping the handle of the club during impact and allowing the club head to flip past the handle and close, hitting the outside of the ball. Try keeping the handle of the club moving around to the left during impact at least as fast as the club head moves through impact, versus the handle stopping and the club head flipping past.