Is it difficult to change the spark plugs on a 99 contour with a v6?
Very easy. Remove the engine appearance cover on the front of
the engine (Should say Duratec V6 or something similar), 3 bolts
hold it in. Next, remove the silver box underneath (IMRC)by
removing 3 bolts, gently set aside. This will give you access to
the front 3 plugs. The rears can be accessed as they are with a
long extension bar. For added room on the rear 3 plugs, remove the
coil pack by taking out the 4 mounting bolts...just remember to put
the grounding strap and noise filter back on when putting the
mounting bolts back in.