Partial load solenoid

Ok so I fixed out the leaky fuel system, stuffed a ball bearing up the pipe to the egr thingy (i think) and now the partial load solenoid thing under the battery aint working, noticed when at idle at lights etc the engine sounded funny, like something was loose, looked today and the partial load motor aint doin wot its supposed to be doin, I unblocked the rubber pipe to the diaphragm by the intercooler but even that dont have any vacuum there now, there is a vac solenoid thing at the back of the engine bay on the passenger side, which was goin mental the other day, now im totally lost, can anyone explain how all these tie in together and how it all works, so's I stand a chance of finding the problem ??