Hi Rachel,
I am going to provide information for a 2004 Mercury Sable 3.0L. If you have the dual overhead cam, it will be the same. I just double checked.
Firing order. 1-4-2-5-3-6
The two pics below indicate cylinder location and coil information for each cylinder.
Let me know if this helps.
Joe
Images (Click to make bigger)
Sunday, January 19th, 2020 AT 8:14 PM