Duramax problems need help bad

i have an 03 2500HD 6.6 duramax....it has a starting problem...when its cold it fires right up... after i drive it and its warmed up and shut it off and try to start it again it wont start... i have to let it cool completely down in order for it to start again...i've replaced the filter and that didnt help...it finally threw a code the other night saying it was the crankshaft position sensor ... i replaced it today and still have the same problems...anyone know wat it might be?? i was thinkin maybe the coolant temp sensor... any other options?? the help is greatly appreciated!

Try this forum link. These guys are all diesel and are good.

http://www.dieselplace.com/forum/index.php