, I just bought a 94 sti on friday. I'm having a problem with it at the moment. I just want to see what you guys think. when the car hits about 4500 rpm its like as if the car is running out of petrol. for a few sec then its it take off again it just happens when the car is betwen 4500 and 5500 rpm.. could it be the fuel filter.. the car was sitting up 2years before I bought it,