Stumbling at 3k +

All this 'maybe this maybe that' only wastes time and empty your pockets. If you want to 'fix' it there is a thread for that.
Ahh, right! Your thinking 'but I don't have a surging idle'!!
Well do the list step by step, don't skip around (I think it says that in the first couple paragraphs) keep notes of the results, the next step depends on the results from the one before.
One thing I will add, you could install a fuel pressure gauge, temporarily zip tie it to the wiper arm and monitor your pressure while you drive it.
 
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