2002 Marquis LS Manual

A few months back my wife and I purchased an '02 Grand Marquis LS. Love this car! HOWEVER! looks to be a mess to work on. Thus, I need to find a good manual for this vehicle. Any recommendations? It's starting to miss, kind of stuttering here and there at cruising speends and fuel milage seems to be dropping a little. Nothing serious but does concern me. Other than that, as I said, love this car. So, need to get a good manual for this car to make sure I'm "doing things right".

Thanks in advance