Thanks guys. Im not a car person at all - I just want the thing to get from point A to B.
My current car (92 Subaru Liberty) has been great, but on the way back from Bendigo to Melbourne, the spark plug leads where popping off, leaving me with only 3 cylinders - that was causing it to overheat, which is a slow death for an engine. Hopefully its just dodgy spark plug leads, but I suspect that some combustion gasses are somehow escaping past the plugs, and causing them to pop off...
I will take it to my local servo, and see if its an easy fix...(usually a forlorn hope)