Yes, when changing spark plugs it is a good idea to change all eight so the firing will be even.
1 - 3 - 4 - 2
The spark plug firing order is ( 1 - 3 - 4 - 2 ) and the distributor rotor turns CLOCKWISE
From the front of the engine, the spark plugs are numbered 1-2-3-4. The firing order is 1-3-4-2. - Haynes Repair Manual #36071, 1993-2005 Ford Ranger Pickups.
Check 2carpros.com/forum/. There is some interesting help there.
http://www.rebuiltautoengines.com/ford-ranger-articles.html You can get it all here with detailed pics of cylinders and coils
the ranger station . com ( no spaces ) Click on Technical Library
You probably mixed up the firing order.
The firing order should be stamped onto the engine block at some location, or on the stickers at the front of the hood.
1 - 4 - 2 - 5 - 3 - 6
try changing your spark plugs if theres any.
Here you go, click the link.