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I have the same truck that you have and had similar symptoms. My problem was a blown head gasket and coolant was getting in the oil and a cylinder. Easy enough to check to see if coolant is getting in. Take the valve cover off and see if you see any discoloration in the oil on the inside of the cover (coffee with a lot of cream). If you don't see the discoloration, then it could be blown differently. Compression check maybe?
This is the second head gasket that has blown on me, but the last time (about 10 years ago) it was just between the 3 and 4 cylinders where the wall seems quite a bit thinner than between the other cylinders. The engine made a ton of noise then and a dealership service center actually diagnosed the problem as bad connecting rod bearings. They wouldn't do the work and tried to get me to buy an engine. I said no thanks, checked it out myself and discovered the head gasket was blown.
Not sure this is it, but I messed around looking at a bunch of other stuff before I took the valve cover off and saw the coolant in the oil.
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