Yes, all spark plugs need to be gapped... but make sure you keep in mind that if the gap is not correct - if there is not enough gap, the spark will not be big enough, and if it is too wide, then there will be too much spark.
Standard seems to be .45 but I would check with a dealership near you for a size recommended by them, the underhood specifications, or the brand's specs for that application, as they vary from 44-54!
The 2002 Ford Ranger in NORTH AMERICA has a 2.3 L DOHC four cylinder engine and the spark plugs are gapped at .044 inch
On a 1966 Ford Mustang : 200 cubic inch inline six cylinder engine : The spark plugs are gapped at ( .032 to .036 inch )
In a 2002 Ford Expedition : For the 4.6 or 5.4 liter V8 engines : (there are 8 spark plugs )
I was looking at one of the Ford websites and it shows for the 4.9 liter / 300 cubic inch inline six cylinder engine in 1966 : ( for light duty the spark plugs are gapped at .035 inch ) ( for medium duty the spark plugs are gapped at .030 inch )
On a 1995 Ford Contour : According to one of Ford's websites : The spark plugs on the 2.0 liter four cylinder are gapped at ( .050 inch ) For the 2.5 liter V6 ( .054 inch spark plug gap )
( .044 inch ) for the 2.3 L in a 1993 Ford Ranger ( according to motorcraft.com )
According to one of Fords websites : For a 1993 Ford Tempo , 2.3 liter four cylinder engine : ( the spark plugs are gapped at .054 inch )
The spark plugs should be gapped between .042-.046".
( 8 spark plugs ) for your 4.6 liter V8 engine in a 2002 Ford Explorer
According to one of Fords websites : For a 1986 Ford Mustang , 5.0 L / 302 cubic inch V8 engine : The spark plugs are gapped at ( .050 inch )
There are several different "Bosch" spark plugs that don't need to be gapped (actually gapping them will damage them) that are perfect for Ford Thunderbirds!!!
According to one of the Ford websites : For a 1988 Ford Escort , 1.9 litre four cylinder engine : The spark plugs are gapped at ( .044 inch )