pics of your engine please.
note the bolts above and below the EGR tube on the right.
on my 2005, and 2002, the 4 spark plugs are easily accessible.
the 4 items under the intake manifold are fuel injectors.
the vacuum line for the brake booster connects to the manifold, should be obvious.
don't pull hard enough to break anything, replacement manifolds are not easy to find.
I'll have to look, it's been a while since removing the intake.
does yours have the flapper controls? that's a vacuum actuator at the rear of the manifold. I'm not sure what year they were discontinued on Mazdas.
follow the hose from the PCV valve, it connects to the intake.
also, replace the PCV. it's the blue elbow. the retaining ring snaps off.
the top pic is a 2010 2.5 out of a Fusion.
the bottom pic is the 2.3 I took out of my 2005. lighting was not the best, oops.