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If you have had a cylinder head job done only one week ago, then the shop should warrant the work they did, AND anything they didn't do that may be causing this to happen now.
They should have ensured the intake was clean enough to refit.
It is up to them to now see whether they can perform an upper cylinder clean with Sea foam etc.
You should not have to pay anything else, considering what you have already spent.
I hope this helps.
I hope my advice has been of assistance to you.