05 Escape

2005-ford-escape
My 2005 Escape with 97k sat idle in the garage for a few months. Now it runs rough and I get a check engine light and codes for misfire, O2 sensor, catalyst, and EGR. I am not a mechanic but I was told that a misfire could trigger all these codes and that I should start by replacing the Plugs and coils? Is there something easier I should try first?
WRT plugs and coils I can get 6 coils and plugs online for my V6 3.0 for $79. Ford.com lists just one coil for $85, Is this a quality or a rip issue?