04 with egr delete,pretty much stock.had oil changed and truck started running like crap.so much it has been parked til last week whenI had time to work on it.checked oil for start up and noticed fuel smell.changed oil and trick started to run a lot better.checed oil after warm up and no fuel in it.drove it for about 15 miles and checked oil and fuel was back.Injector,IPR, or what? Help Please

 

when i last changed my oil it had a sweet diesel smell to it. like i almost wanted to taste it, it smelled that good. ive been told its preatty standard on these