1976 Buick Skylark Spark plug order

Engine Mechanical problem
1976 Buick Skylark 6 cyl Four Wheel Drive Manual

I have a 231 Buick V-6 in a 1986 toyota pick up. After I was done doing a tune up on the truck I noticed the turck was running rough almost sounding like the cylinders werent firing correctly. There might be a possible chance mixed around the spark plug wires, on the down side I dont get the manual until sometime next week. What is the spark plug wire order? Or do you think this is the problem?