Car struggling to start, gotten codes P0335, P0340, P0345
 

For a few months my frs has had issues starting, which I originally thought was my fuel pump until I received these codes about a month ago. I cleared them and then replaced my crankshaft position sensor and that didn’t fix it. Codes just came back so I’m thinking of testing my camshaft position sensors. Has anyone else had this issue and have any advice? It’s not a bad battery, alternator or starter.