Cool, thanks Jug, I thought it my copy of elearn seemed a little erm... rustic!
Replaced the spark plugs now, which were well past it, and acceleration is noticeably smoother, although the stalling is still there.
I'll check out the idle speed actuator soon and let you know how it goes. I know there's alot of information on here about the idle actuators so I'll read up before asking any questions.
A mate down the pub just suggested to me something interesting though that I would love to here your feedback on.
He suggested to me that the problem might well be vacuum related? He said how something called a "Plenum valve" might well be where the problem lies. He was going along the lines of there being a either a perished rubber pipe or seal around the area of under the inlet manifold or throttle body that might have gone.
He said he had seen a Vectra and an Alfa both into the same garage with the same symptoms as mine, replacing all the usual failing points, and end up being this Plenum valve being the failing point???
Would really appreciate your opinions on that new angle of solving my problem, and as you now know my elearn CD is buggered, could somebody please give me a clue on where to inspect this valve and what it looks like?
I really do appreciate all your patience here guys, as I am a complete noob to car mechanics and this is my first experience in anything like this. But I am enjoying getting more confident and experienced with every day spent oily, so I can only thank you all again!