I have just got my first skyline and it was running fine when i drove it back from when i brought it (about 11 miles) the car sat outside for a week and when i went to start it battery was flat so i fitted a new battery , started it up and it seemed very missy/popping when i tried to rev it (around 3krevs) when it warmed up it then reved . then next day get in it and it wont start so i turn alarm of by entering the pin number thinking its imobilized itself and it started up . went out for drive and as soon as you give it some welly it starts to misfire , pop and backfire in every gear ?? drive it like a normal car and its fine .now today i got in it and it started fine (with alarm back on) went to top of my road and pulled out on roundabout and it wouldnt rev atall and was popping and banging through the exhaust until it cut out , got it started and held revs at about 2k for a while and then it was fine , drove away and still getting the popping/back firing/missing when you give it some throttle (about 4-5k) . its doing my head in as i dont want to break it !! car is a 95 gtst spec 1 with cat back exhaust , apexi induction kit , front mount intercooler and a shift light ! have not checked plugs/coilpacks yet as it seems a bit more serious then that? it will boost to 0.5 and other times not ? i found that the boost wire (black one ) had been cut and earthed out so i rejoined it but is still the same ?? please help as i went from a scooby to one of these and ive only had it 2 weeks and its gone wrong already !!