Looking at your third picture I don't see the tube that connects to the bottom of the intake tube between the air cleaner assembly and the throttle body. If I remember correctly that line runs from there to the front of the drivers side valve cover.
You will need to change your 02 sensors at some point if you blew a head gasket. The passenger side is in the exhaust downtube(right after the exhaust manifold). The drivers side is in the exhaust manifold and is kind of a pain to get to. You are going to want to buy a 02 sensor socket to make sure you don't round off the 02 sensor because they are probably pretty tight and hard to get out. However, your 02 sensors aren't used until the car warms up so if it's not running right when it's cold and first started up, the 02 sensors aren't the problem. I was driving my car for a day with the drivers side 02 sensor unplugged on accident...Car still ran fine, just threw a CEL light once the car warmed up...
I wouldn't bother pulling the plugs wires yet...I'm guessing it's a vaccuum leak...You might want to get a code scanner and see if you have any codes...