right, the problem is my car sounds like its missing(3cyclinders) and the dumpvalve isnt as loud as it usually is, its a faint flutter. i think it could be an air leak but i have checked all boost and vacuum pipes etc. i have a new coil coming tomorrow. i have changed sparks, ht, dizzy cap. all compressions are good. just abit stuck and have run out of ideas on wot to try, your help would be much appreciated as i have only been a pulsar owner for 2months now....... cheers sam