missing

An misfire particularly an misfire during damp conditions is usually ignition related. I am not sure about that Ford engine but I know some Fords that have coil over spark plug ignition systems like your engine has , have problems with the ignition coils and the engine will run awful and surprisingly not set a code. If the engine is running poorly when it is being tested it may be easy to diagnose which coil is bad if not some scan tools give a "cylinder misfire count" or your car may have a pending code stored in its computer indicating where the problem is.