Question

What do I do to fix this problem?

Answer 1

P0506 Idle air control lower than expected

P1336  Crankshaft / Camshaft sensor range performance

These 2 code together you would need to check for a mechanical condition especially with the timing chain and the timing gear,

 What affect and cause P1336 would be the VCT solenoid being non functional. as in this case.