Hello, with me everything is going really super cares me very lovingly for my Saab, had had a lot changed. Last month I thought that it was time to change spark plugs and the petrol filter. ( spark plugs were told to me in summer already that it would not be bad to change the in 10 000 km or so, fuel filter..no idea if the changed and when at 187 000 km it would not be wrong I thought) Order everything also other small things (Ant i nne etc. ) at Elkparts, NGK Platinum and because filter, everything comes quickly to everything super… for the first time. Then let change in the workshop ok. Then the car did not run at all ok, no power constant jerking, irregular work from the engine (only with warm engine) high consumption. So clear… the spark plugs were corrupt, or the filter…before everything was tip top. Had already checked cables and so back to the workshop there…running around the stuttering explained spark plugs changed (i ch never experienced the defective sparks arrive) unfortunately no NGK anymore but Saab..ja autsch expensive and are actually NGK, no matter. Then car taken super no stuttering or jerking drives when speeding up, power is also there. Only one thing is the annoying. It’s again with the warm engine when I stand at the traffic light, sometimes to feel an unconstant work from the engine. That there was not before. Should I go to the workshop and ask if the filter is properly mounted? Or please gi bt me a advice. As I said it’s not always but sometimes you notice it and you hear it as if the computer tries to normalize it (I’m really not sure biite not laughing) So wait for your tips, and sorry wanted to explain everything with 3 sentences but with my speech keys and will to convey it to you it wasn’t easy, greetings