It only does it with the A/C on right?
It's not a problem then, the A/C just sucks allot of power from the engine, the bogging down feeling you are getting is the A/C clutch turning on and off. As it would burn up the A/C if it ran continuously. So it turns on and off at regular interviels. The RPMs jump because the A/C pump disengages and so the rpms rise naturally.
Nothing to worry about man, we just have a very powerful A/C system ;)
You should also notice she accelerates allot faster with the A/C off to ;)
2000 Ford Focus US Spec Zetec 5 speed "Blue Dragon"
2000 Renault Clio 1.4 DOHC 5speed "Snap Dragon"
Hatch Nation #32