WR1 Owners Club

Hi all ive recently got number 166 and over the moon with it. When im in 5th or 6th and gently accelerate sometimes she will miss slightly untill i accelerate harder or let off. I am a mechanic and it feels like she has a plug or lead / coil pack playing up. She only has 35,000 on her with full history. I have not had time to look at her yet so thought i would ask and see if anyone new of any common faults relating to this. She is fitted with exhaust system, dump valve, k&n induction and re-map as far as i know....Any ideas would be much appreciated. Ray

Ive had this before ! stick a new set of plugs in should solve the problem