So many CEL codes at once.

[vman5911]

I have a 2000 V6 Solara. Initially, I got a check engine light indicating that my EGR valve was probably faulty and that the position sensor was faulty as well. Soon after, I began to get error codes indicating that the oxygen sensor and air/fuel sensors were probably faulty. Soon after that, I started to get the Closed Loop Fuel circuit coolant temp insufficient code. Add that to random cylinder misfirings and you have a very, very frustrated person with a car that isn't running very well

I'm at a loss here, guys. It's starting to get to the point where I don't even know where I should start. Any advice would be immensely appreciated.