Firstly, you gotta remember, this is a 480 forum, so the car's are different-not all will know the answers.
The fog lights have to be accessed from under the front bumper-get it up on axle stands if you have them. They're fixed by 2 x 13mm (i think, maybe 10mm) bolts onto the bumper beam. Piece of cake getting them off. But the fogs on late 440's are the same as late 480's-they're sealed, so you'll have to find a way of getting them apart then resealing them.
The bumper does have bolts through the boot, but i think there's more than two...was a long while ago now-it's not hard to get off though. It maybe sagging because it's slipped off the plastic tabs or they're broken. Here's two pics of my old 440 with the bumper off, don't know if they're any help or not:
http://www.volvogallery.org.uk/showphot ... &ppuser=89
http://www.volvogallery.org.uk/showphot ... &ppuser=89
Looks like it may just be the two bolts and the bumper slides onto the plastic tabs on the side.
The grill would look smart black-a mod i wish i'd done on mine. Here's a pic of a 440 with black grill-despite the fact i uploaded it, i don't actually like the car, but a black grill does look nice:
http://www.volvogallery.org.uk/showphot ... &ppuser=89
Might look nice with the whole thing done in black, no silver left at all.
With regards to your revs, i had a similar problem, mine also being the 2.0i. The big black pipe that comes off the inlet manifold has a little blue sensor sticking into it. Occasionally, this got dirty for some reason, so i nipped to my Uncles garage and he cleaned it out with carb cleaner. Used to do it on my 1.7i 440 too, the revs would sometimes stick at 1500+, a quick clean of that sensor cleared it up.
Hope that's some help...
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Aww, that would really upset me knowing a beloved car was torn to shreds, especially if it was a really hard decision to make about selling it. The only consolation really would be to know that, perhaps, the car had been used to make another one better (like a donor 
)
