hey,
I've noticed something strange with my car, sometimes when i'm idling at the lights or in a carpark or something it usually sits on about 800RPM, and it randomly spikes to about 2000, and back down, up, down, up,down, until i give it a bit of gas. now it doesnt do it all the time, its not when its cold either it can be anytime.
this ever happend to anyone else? and would a service + tune fix this, hopefully its not too expensive
thanks