Code set off p0021 p0014 p0011- confused as to problem. Happened after clutch and flywheel replacement

First I recommend an oil change and then have codes reset as these valves work on oil flow and dirty oil can cause them to stick and not function properly (especially if the oil is very low). If problem persists, the issue may be either a crankshaft or camshaft position sensor. Go with a good oil change first and code reset and proceed from there.