would a bad oil pressure sensor cause an intermittent no start senario.

No. Does it only not start after sitting for a few hours or more? If so it is likely an injector issue.

no it runs great but every now and then it just wont start.if i let it sit a few hours it fires right up and runs great for a month or so then one day it wont start.it only does this after ive driven it,not like in the morning or if i dont drive it for a day.it always starts and runs on first start up.

Any codes?

no codes,had 2 diff.shops run a complete scan.shows nothing.but by the time i can get it to them(thank goodness for AAA) it fires rite up and purrs like a gorella.

Did they test the injector return flow? If its too high at any injector it won't build rail pressure enough to fire the motor. There are some troubleshooting tips here under the heading

ENGINE WILL NOT START/HARD TO START

http://dodgeram.info/tsb/2006/14-003-06.htm

i dont know what they did.but for 400.00 bucks i would hope it was thurough.im going to re look at my bill and see if i can decypher it and ask them some quest.Thanks for the link,i am mind boggled by how complex things have become.

Post up what they say.
Often the problem is the injectors, but they are expensive so its worth taking some time to troubleshoot for other issues first.