When I bowling I take a 4 step approach, but I cannot get my knee bent, and I am leaning a little bit forward, I have been working at it and I will continue to, but I can't keep my center of gravity back and I can't my dang knee bent! Any ideas I am going to get someone to record me so I can get a better look at it. Any Ideas, all thoughts will be appreciated thanks!

Really need to see a video. Both back and side views will be very helpful. Kind of hard to say what might be going on with out actually seeing.

What he said

but you could try keeping your shoulders square and head up from start to finish...that may help the leaning over at the line..but i could be way off without seing you bowl

Yeah, I'll keep my head up when I bowl, most of the time I am looking down at my feet, thanks for the help, and I will see if I can get somebody to record me.

I had this problem a while back as well, and what it took for me to hear was that I was bending at my waist and not with my knee. It really helped me to focus on keeping my back straight. If you try thowing a ball with your back and your knee stright...it's hard. I also try to imagine that my shoulders are staying above my hips.

Like the other guys said, a video would be big time help, but these are just a few things that generally helped me when I was struggling with the same issue. Good luck!

Matt