Here is a list of the codes I am getting, a few are obvious fixes, others are not....

P0431 Catalytic Effinciency to low bank 1
P0431 Catalytic Efficiency to low bank 2
P0301 Cyl 4 Misfire
P0303 Cyl 3 misfire
P1423 Secondary air flow to low bank 1
P1411 Secondary air flow to low bank 2

So the obvious is I need new cats and I found a place in town that has them installed for $540. Now as far as Misfiring I just had all coil packs replaced by the dealer because they had a recall. I have no replaced the spark plugs yet so I'm wondering if there can be any other reason for misfire??
I do not know where to begin because I dont know if this is a cause and effect problem where fixing one thing could solve the problem.

Any help is greatly appreciated!

 

vacuum leak. SEarch your hoses for cracks or signs of wear.