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
Underneath the coil packs, which are the square black rectangles with the seven bolts holding them down.
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
Only the Olds Intrigue with the 3.5 L
Need clarification on what you are asking.
Under the glove box.
Dealerships or junkyards.
They are attached to the end of the HT leads.
Looking at the top of the valve cover there is a cover in the center. The spark plugs are right below that cover.