Hey guys first of all thanks for all your help recently... MUCH appreciated.

Now, I was doing some searching about my 'event' the other day and I stumbled on a few threads that described my car perfectly - Shitty rumbly Idle and BAD fuel economy (i.e. if the guage is correct 1/4tank (20litres) got me <40miles)... This is 9mpg - and at £5.09 a gallon I can't afford it!Their problem was in the HT leads so I found out you test them by running the car and pulling them out one by one to see if the idle changes or not...

My question is can I put them back in and move to the next one while the car is running or do I need to switch off? I am hoping this is not a stupid question, but it seems a bit dangerous messing with the electricals while its on!

It only clicked in my head while reading around that when I changed the sparks I found one of the HT lead boots had a small peice of curved plastic or metal inside that looked out of place. I thought nothing of it. Could I be running on 5 clyinders and not know as such? Would this give me such bad fuel economy?

The idle is rumbly and with the door open you can see it move. I've checked the sparks and for intake leaks and I think fuel pressure is ok as no problems in running... Injectors are noisy and may change them for the Ford 19lb ones soon if I don't find a fix to the fuel economy problem.