Drive a Justy 1.2 gl2 (75ps), year 1992. I am very satisfied with the car, especially in winter all-wheel racing, but my justy accelerates in only 18.5s from 0 to 100km/m. At all it doesn’t like to turn high, from about 4500 rpm it becomes tough. I have already replaced the spark plugs, installed a sports air filter and renewed the end pot. I have 145/80 R13 on it, and 90000km on the tacho. How fast does your justy accelerate? What could be the cause?