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Just another idea. You might check your air filter and mushroom. You may have picked up something that is giving you an air restriction. That will make it smoke at stock fuel setting.

One of my trucks shows 15 lbs pressure at idle and 30 running. It has not given me any trouble yet. A common problem with these trucks is a mismatch between the oil pressure sender and the gauge. This will cause your oil pressure to show 1/2 actual pressure. I agree with the other posts when...