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Hello, if you are getting fuel then I'm sure that isn't the problem you are having. It can be difficult to diagnose without codes that is correct. If you have a high pressure oil leak then I would get OTC fitting 303-765. This goes into the ICP test port to test for an air leak. This will allow you to actually hear where the air leak is coming from. On this particular vehicle you don't need a new HPOP with an STC. If that is the case. It could be a faulty IPR valve or an injector could have broke causing the high pressure oil leak. I wouldn't go buying a bunch of parts without an idea of where its going. This is where I would start though. If you have a scan tool that will read ICP pressure while trying to start that will be very helpful. If you build up to 500PSI the engine should start. If it doesn't start with 500PSI then there is another issue elsewhere.