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If engine was just rebuilt and you have low compression on one side either the job was botched or perhaps the plugs are not in all the way and are not tight resulting in compression loss. If they are in properly you have a valid complaint against those folks that worked on your engine.
Could also be valves that are not seating properly or bad piston rings.
Dead cylinder...do a compression test on each cylinder and write the numbers down for each one, you will probably find at least one of them with a zero reading. Then squirt oil in each cylinder and test again. If the pressure tncreases over the first reading it indicates worn rings, if it stays at zero then you probably have burned valves. If you have water in the oil or visa versa, or zero readings in cylinders next to each other...it is a blown head gasket, and or warped head.