is it just me or when you have certain parts the mobile suit has a special ability added. i.e. three high mobile boosters get u a longer boost and enemie beam weapons do less damage

If you get the Part x 3 bonus, you get a special ability. I've only seen one or two; they're pretty nifty.

dont work with some parts like the firing program

Yeah, I went back and noticed what I said doesn't work. Guess, you're right, its certain combinations, thats probably tied to the part bonus and the engineer bonus. More research is required, but unfortunately, my stock of items isn't that great.

any one have 3 bio-sensors, 3 MUSOU units or 3 future predicition programs (a.k.a. the true ZERO system)

This FAQ has most of the part combinations.

i hat this one of the acheivments is to get all the skill and maybe parts but that will take freakin forever!

just all the skills, not all the parts that is a bonus if you try to get all the mobile suit to level 10 (also a acheivent)