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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Often the supply lines will get twisted when tightening. The nut you tighten pulls the flange with the seal to connect with the water supply valve. When tightening the nut it will turn the flange and in turn twist the supply line. It might be twisted up high so have a look with a flashlight to see if it is twisted. If it is then loosen the nut and un-twist the lines then while holding the flange shank with one pair of pliers, tighten the nut.
If you remove the spray head from the hose, then run the water does it still sputter? Does it do the same whether using hot or cold? Do you still have the tool to remove the aerator from the end? I guess from your description that you had already removed the spray head from the hose and checked for debris but just wondering if it still sputtered when running it without the spray head. Full strength out of the hose hot and cold?
The tool might be like this. click here
I haven't heard from you. Were you able to remove the aerator?