distributor

The original distributor went Kaput! Shards everywhere. Replaced it. Then I got the P0340 code - Camshaft position sensor. Took it back to OReilly's and got another one. Same thing keeps happening. I'm tying not to think that it's OReilly's fault but this is the second one... I dont want to have...

Hey guys, I've read up alot on others who have had same to similar issues, but I'm still in the dark. The engine light come on last week, ran the codes and got a knock sensor and misfire in cylinder 2 code back. I replaced the plugs, wires, cap and rotor (the rotor didn't wiggle at all)...