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I just replaced one on a '91 Lumina with the 3.1. It was located along the side of the block (radiator side), just over from the oil filter. The coils sit on top of it and are bolted to it. Each coils slides down onto a couple of connector posts coming out of the Ignition Modlule pack. The Ignition Module is a flat rectangular plate, just thick enough for a few electronics. The Module replaces the points and pickup as used in the distrubutor on an older vehicle. You can remove the complete coil and module bracket assembly with three or four bolts and then switch out the Module on a bench. The assembly is a mounting bracket, the Ignition Module, and the Coils. The Ignition Module probably has three connectors going to it, one for power, one from the Crank Position Sensor, and one from the ECM. You'll need to disconnect these before removal.
There's a lot of different modules from different manufactures, over the many years. As such there are many different connectors needed for good tester. The Autozone nearest me, didn't have the necessary wire harness and connector ends, so I ended up going to NAPA to get it tested- Also for free.
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