I have a 2007 jeep laredo 6 cyc. It won't crank unless I use starter fluid. once it is started it appears to run normal. Not sure what part of the starting process is failing or where to start trouble shooting.

You're in the wrong forum. This is the XJ forum which ceased production in 2001. Try here: https://www.cherokeeforum.com/f5/

If it starts with fluid, you have a fuel problem. Check your fuel pressure key on, not stated.