If it is 3.5 liter v-6, they are in two spots. The first three are in the front of the motor. The second three in the back. They are under what is called the"ignition coil cassette". Right in front of the cover that says 3.5 liter is a piece that is about 4-5 inces wide with another piece on top of it about 2-3 inces wide. On the right of this piece you will find some wires plugging into it. The 3.5 liter does not have actual spark plug wires. The wires goto this cassette and this cassette lays on top of the spark plugs. There are seven screws to this cassette, four on top and three on bottom. Once you figure out the front, you will find the back set. However the back are a terror to get to. I had to replace all of the back plugs by feel. I could not see them. !!
Try replacing the plugs and wires
I dont remember if I used different rachet swivels or if I took off the valve cover,one of the two try the swivels first
Underneath the coil packs, which are the square black rectangles with the seven bolts holding them down.
Platinum's
134a
Only the Olds Intrigue with the 3.5 L
Under the glove box.
5 quarts
Need clarification on what you are asking.
Dealerships or junkyards.
If it is a 3.5 unhook battery remove coil packs on top of valve covers and unplug, pull boots from plugs remove plugs with spark plug socket. be sure engine is cool set gap is printed on emision tag. make sure coil probes line up in boots when reinstalling coil packs
They are attached to the end of the HT leads.