WD40 the EGBV actuator arm (down the back of number 2) and replace the vacuum hoses. Most people go for silicon hoses for looks, but ideally go for rubber hoses (you can get cotton-braided rubber vacuum hose from Demon Tweeks) would be a good start. Also replace the EGCV hoses and check the VSVs and actuator valves.
The EGBV pipes are an absolute b*stard. Expect a lot of swearing and scraped knuckles!
:edit: I had problems with no2 previously where it was stuttering, turned out to be duff coil-packs (I think - I replaced the fuel pump at the same time as well though)
If everything else is fine, it could also be your pressure tank has popped it's clogs which would explain no pre-spool (well, that's my understanding of it anyway! )