I have 136k miles on my quest and a week ago I went outstide started my car and was idling rough & was shaking during acceleration. The engine light came on and was blinking. Took it to the dealer and they said it was a missfire & knock sensor error from a failed fuel injector#4. I had it replaced $550 but they said to fix all 5 other injectors as they all go up at the same time I said no because Mechanics can be wrong just like Doctors. 10 miles from the dealer it started again but this time it was missing terribly.
Could this be water in the gas? Would that make my engine light come on and could that make my injectors fail?