I have a 2002 E-450 Bus cutaway. It wont start. Shows dummy lights for low oil pressure and oil pressure gauge builds slow during cranking. I took off the HPOP top plug and the oil level is up and oil level overall is full. With the top plug out of the HPOP I cranked it over with no oil sputtering out of the HPOP. I read that this points to a bad LPOP. Is that true? About 3 years the IPR and ICP were replaced with a no start rough idle symptoms. After lots of fuel troubleshooting and headaches I found out it was a faulty IDM. I am thinking its time to replace the LPOP. Anyone have any suggestions before I try this out?