First, if you got water in the fuel, the engine would buck or not run. A rough idle is most likely caused by a sensor. Is the check engine light on? Have you ever had the computer scanned for trouble codes? Most nationally recognized parts stores will do it for free. I recommend having it done. Let me know what you find.
Regardless, the filter is mounted to the inner side of the frame rail (driver's side).
Let me know if this helps, or if you have any other questions.
Monday, September 7th, 2020 AT 1:26 PM