Brian there is no dump valve fitted but there is a big (unknown brand) air filter in her.
Murto the car is running fine.the revs went up to 2000 stuck in traffic on thurs night!it idle's fine (around 400rpm when idling) but it kind of feels like the car is a bit shaky when idling!
take off the idle control valve and give it a clean with carb cleaner, get some maf cleaner and do the same there....1 of the 2 might just need to be cleaned.....
After a drive home tonight,when i dropped a gear to overtake a car it flashed on and off again and stayed on.this is similar to the last two times this has happened.
Going to have to get her checked tomorrow.with xmas around the corner im praying this wont cost too much