I have a 2004 SRX AWD V6 and I hear a loud rattling noise when I start driving at low speeds and when I come to a stop from a low speed. I was told that it may be a timing chain issue. My check engine light is on and I am getting 4 code P0300 Cylinder misfire detected random cylinder, P0303 Cylinder misfire detected Number 3, P0305 Cylinder misfire detected Number 5 and P341 Cam sensor condition. I am wondering if you have any information on these codes and the timing chain issues with this car.

Thanks
Tonya