Hey peps, i am new to the forum cause i am having a b*tch of a time getting some straight answers from workshops. Story goes i have an 4 door r34 skyline with the usual mods (boost controller, bov, fmic, 3" turbo back exhaust, aapexi safc2) running 8 psi of standard turbo (175rwkw before fmic and afc2). The problem i am having is that since i had my 100000 service the car runs rough like it has dropped a cylinder, engine light comes on the dash and so does the tcs & slip lights. Almost sounds like a wrx is the best way to describe the sound. the service included timing belt and new plugs (iridiums). i have had the afm, cas, checked out and they are spot on. can anyone help?????? this has been going on for three months, it only does it when it's hot outside and i start the car...doesn't happen under load.