Hello, i have a fiat bravo 182 1.9 jtd 105hp, and the car feels very instable when i pass the speed of 100km/h, is like i have something loose doesnt make noise, but if i make a corner the car reacts fast and rear feels loose, i have AP coilovers, i have front suspension converted to hgt wishbones brakes and hubs, oz racing 16, and dunlop sp sport max tyres, i dont know what is???