The firing order for a 1998 Dodge Dakota with a 2.5 liter 4-cylinder engine is 1-3-4-2. This means that the spark plugs in the cylinders should be fired in that Read more Ford Expedition XLT +3 What do you mean by a mod function? Asked by Wiki User A modulo function finds the remainder term when you divide one number by another number. For example, if you di...