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Hhhmmm!! I see you’ve embarked on a process of “diagnosis by guesswork” as I call it. Not a fan. There’s a saying: “if you haven’t found the fault yet, then you haven’t done enough testing”.
Having said that, giving a car a full service can only be a good thing, so in this instance it’s not really wasted effort.
Have you checked all electrical connections and checked all harnessing for any signs of damage?
Have you checked you’re getting a nice fat spark at the plugs?
Have you had the ETCs read?
Try swapping #2 and #3 injectors round and see if the misfire follows the injector (or not)
Carry out a compression test, cold and hot, dry and wet.
Have a look at the combustion chambers to see if it’s coked up (look down the plug holes – use an endoscope)
Check the cleanliness of the throttle body and butterfly.
Have you tried a different brand of fuel, including Super?
Also is the misfire under certain conditions or all the time?
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