04 duramax 6.6L running rough
 

My truck has been running real rough but then will run fine at times. It will go in to safe mode then I turn the truck off wait awhile and it will run half way decent again. I had the codes run and a PO192 failed fuel pressure, PO193, PO19 fuel pressure sensor circuit low voltage all popped up. I was wondering if any know what could be wrong exactly, is it a bad sensor, someone also said it could be the fuel filter, and someone tried to tell me a bad injector but i don't think one bad injector would make it run like this. If you know what the problem is how much will it cost at a dealer to fix?

Any help would be much appreciated