hi i have yet another problem with my rs runs lovely apart from when i come on boost it will start to lift of then just go flat make alot of noise and not realy go no where.could spark plug gap caues this or faulty spark plugs them selves it does not back fire just goes flat starting to get pissed of now as every day it seems to have a new problem i have spent out on group a coil group a 10mm leads cossie plugs(which i havent fitted as icant get the car to run propaly on them)has anyone got any ideas would be very greatfull