Hey Sz,
Haven't seen you post in a long time, good to see you round!
Two things you did not mention there, the coil packs, or the MAF sensor.
In my own case, it was the MAF sensor that fixed the problem, for Gargoyle here, the #3 coil pack was broken.
You should run the diagnostic to see what code shows up. If you have everything cleaned up and tightened down, then the likely suspect is a sensor.
Check the codes. Should be a method written up in the How-to if you have not done it before.
Joe
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