yes it seems lots of little problems all joining together can make it seem like there is a different problem and send you on a wild goose chase. best bet is to slowly tackle one thing at a time and you will get there eventually.
slight lack of power occasionally, leaky exhaust
water loss, radiator leak
mayo in oil cap, wrong oil cap
I'm just glad i am able to use the cash i had put aside for the engine on the other things it has been needing for a while, still going to cost me a fair bit, they are polybushing it, changing suspension, drop links, fixing a bearing and sorting out the blowing exhaust and sorting out the mot. not going to be that cheap, probably looking at around £800/900.
Can't wait to get it back now, it's going to feel like a new car.