Have done all I know to do, any ideas? What do I do now?

Hello, the thing that's crazy here is that there's no testing being performed. It appears that multiple parts are being replaced without cause. You can actually cause more problems by replacing good parts. At this point stop, have some testing performed to find out what is missing. When the engine cranks without starting, you are either not having fuel delivery, ignition spark, engine compression or have a timing issue. You could also have an air intake issue - too much or not enough air -- cold engine would be too much air. The worst thing you can do is obtain a suggestion of a part you haven't yet replaced. What you ultimately need is testing to find out what's happening. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops