Quote Originally Posted by sapelo View Post
Sometimes after prolonged cranking it will catch and run fine.
I'm on the same thought as "Jerry Clayton" on this, I would check the ignition to be sure it is on when the starter is cranking.

I had a car years ago that used a fuseable link wire to feed the coil when the starter was engaged, when the link went out it would not start while cranking but would occasionally catch as you let go of the starter.