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Broken bolt and leaks in exhaust manifold
Drop the fan under the glove box reach up and you will find a broken door pull it out, it will work great after that. Common problem.
Oil sludge in pan is blocking the oil screen and pick up. Problem with the 4.7L
Sometimes the shop will get a code for the cam sensor, but its actually the crank sensor that is bad. Have them both changed.
I had his issue, with mine we didn't drive the truck much and it developed an oil sludge problem. The sludge was in the oil pan and while the truck was under load, the sludge would temp. block the oil pick up which would cause low oil pressure, then cause the engine check light. We dropped the oil pan and cleaned the pan, screen and pick up tube, also changed oil. Been running good after that.