There are only two V8 firing orders that Ford ever used. The one most likely is 1,3,7,2,6,5,4,8, but it might be 1,5,4,2,6,3,7,8. Try one, then the other and see which one works.
Try 1243, or 1342.
The correct firing order is: 1-3-4-2
the firing order will be 1342 or 1243
if your asking if that is the firing order yes it is
The firing order for the 1988 Pontiac Lemans is 1-3-4-2. I hope this information to be useful to you
The firing order for the 2.5L engine is: 1-3-4-2