If it's a KA24E engine it's 1,3,4,2.
1991 Nissan Maxima 3.0 liter SOHC V-6 (VG30E)
1 3 4 2
The firing order should be 1-8-4-3-6-5-7-2.
1342, counter clockwise
The firing order is 1-3-4-2 with #1 cylinder being towards the front of the truck. The link below can provide additional information. Kyrasis6 Mazdatruckin.com
firing order for a 1991 cadillac deville
The firing order should be stamped on the engine block right on top in front of the carborator.