Hi All Thought I would post the results of my problem that now seems to be solved, incase other people are having the same issues. The problem was being caused by a split crankshaft ventilation hose. It was only a small rubber elbow, that sits behind the exhaust on the engine block, but boy did it cause major problems to my driving! I also got the valve that joins onto one end of the tube with the other end going into the crankshaft. Drove around all afternoon, kangaroo free, loads of power and am one happy man!! Loads more miles for the fuel now, which can't be a bad thing! Also, as stated in my original post, I have been driving with the ISV disconnected for about a year now. After I fitted the rubber elbow today, I plugged the ISV back in and the engine and rpm were stable! Not been like this in a year. This small elbow sure caused a load of problems. If you have any symptoms like mine, I would suggest checking this as a cheap option before spending loads on more expensive parts. Thanks for all the help on this, hope that this may be able to help others out too. Fingers crossed this is a permanent fix, can't take it anymore!!!!!! :lol: Cheers, Peter