I went to meet a guy who prepares race cars - one being a clio cup car. He had a look at mine, ive written this in a few post earlier. One thing he did do was to reset my ecu - this was done by him turning the key onto the setting where all the lights were illuminated, pumped the acclerator (3 times i think) turned it off for 30 seconds, then started it (i cant remember if these were exactly the measures taken). The car had previously been idling a bit lumpily, kinda miss firing, and now it doesnt do it. Also I used to get the odd flat spot on accleration, particularly in 2nd gear, the pull would not be smooth up through the rev range, and now its back to normal. Apparently the ecu gathers errors from when you stall it etc and resetting it is like doing so to your home computer i guess - clears the errors off and starts a fresh. Ive stalled the car a few times, once and jump started it promplty to avoid looking like a turnip, but thats apparently bad for the cat. (meow) So there you go.