4 out of 8 cylinders have no compression

I have a 2007 nissan titan v8 4.7 4 cycle. Was driving when it started to shake, sputter, slow down on acceleration. Check engine light was going off. Got home, turned it off and let it sit. Next day i started it up and ran for about 5 seconds and shut off and never started up until after an hour or 2. There is no compression on passenger side. Removed valve cover to see if any damage was done to the camshafts but non were present. Cranked it and both spun just fine. What else should I check?