gt-ahhh you must of bought the lemonist lemon out there in the skyline land...
Ive got a 96 GTST II and had it for over 1.5 years and the only problem I had since was replacing the bushes which cost me around 60 bucks for a pair... the original right one popped and spewed white goo all over the drive way.
Skyline = good cars, OK fuel eco. Need to care for them, esp with their age now and they will look after you.