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Most likely ur fuel pump I weak I bet it's worse on a hill u might try changing the filter or running gum out injector cleaner through it, my front tank does this on my i6
Mine starts and runs rough on the front tank only. I'd agree that it is a weak pump. The rear starts and runs fine. Once it's running, the front tank does good.
That's exactly what mon does, my advice is I ur level cycle the key 3-7 times, if ur on a hill then just start off the rear and switch when u get going