ive put the volvo engine in and done all the plumbing,ect, runs fine, idles fine revs up in nuetral fine, everythings fine except when you drive and hit 2500 rpm then it just misfires like **** and wont accelerate,it feels like the ignition is being turned off and on very quickly, it ran fine when it was in the volvo and i havent adjusted anything,ect, it does have a brass bleed valve on the actuator pipe but ive wound it all the way out to take overboosting out of the equation,the problem happens everytime the boost is about to kick in,is there a boost sensor plug or something ive missed ect?? any ideas?? thanks.