when i start my cosworth it idles constantly at 2000rpm for a short time then its goes down in the revs an then picks up to around 2000rpm angain an back down again an constantly does this while idleing but when driving the car the is no problems. anyone have any ideas what the problem is? i dont want to drive the car until it is right again bear in mind this is a 380+ bhp cosworth so power might have something to do with it but i really dont know

regards shea