Hello Saab fans, have a Saab with the 120kw machine, it’s the turbo 16, with 2.0 liters the engine has been jerking since recently – the tachometer then moves when I uncouple between 0 and 2000 revolutions back and forth and if I give light gas, I can drive on, but the engine then also jerks off and on when it hangs on the gas. if the air knife was broken, I already had that, then he likes to take out gas and uncouple, e.g. at the traffic light, when driving had i ch then never problems. Maybe it could also be the ignition cartridge / spark plugs ? (it is the red DI box installed) Year of construction is July 1989, starting it does great – it also has very good compression and otherwise runs very well – I am grateful for every tip