2001 mazda mpv- low power/acceleration

I have an 01 mazda mpv. Everything but the egr, cats, and
o2 sensors are new. All vacuum, emission and evap lines
are hooked up and in good condition or new. Entire cooling
system is two years old. When accelerating or driving; I
have no power after 3400 rpm but the engine will tach out if
I let it. The engine temp will also increase outside the
normal range (to about 2/3 the gauge) if I'm not on a level
or down hill slope. The can also is incredibly slow to
accelerate from a roll or a stop. Any ideas on where my
problem is?