yeah good point by wallace actually if your running a hybrid on a standard set up then it will be running ean as hell have you not got any stage one mods to support the hybrid??? its reccomended to have an adjustable actuator and boostgauge as well as other bits and bobs to support these. I've done all stage one mods before fitting a hybrid. i got the cooling, ignition, management etc all set up before running extra power cause it saves all the problems when i come around to putting the hybrid on things like walbro uprated fuel pump, magnecore 8mm leads, relocated air filter to front grill, HDI front mount intercooler, blitz access ECU, NGK iridium grade 8 spark plugs, hks actuator, race tech boost gauge think I've gorgotton something anyway my point is if your running a hybrid on standard set up its going to cause you pronlems dude id put it back to standard and try it if that doesnt work try a compression test oh yeah is there an engine management light on when this spitting and mis firing happens??? if so get it on a diagnostic and see if a fault code comes up. if so it will point you to whats wrong lol