need help, maybe someone had this problem before. drive a ford sierra bj,88 2,0i gl with an overhead camshaft. first the throttle flap has clamped, got me another, since the installation I have the feeling that the motor is running too fast, coldstart automatic has a tick, but already 10 years, at the ample he runs too high as if he was still cold, but after a while I notice that he is warm and then tours down.werkstatt finds nothing. my presumption… underpressure hose porous….does anyone think about it?