I cannot find the engine computer and I need to replace it. I was told that it is under the drivers side dash, and I was also told that it is under the passengers side dash. I don't see it. Is it the same as the PCM? The repair manual says that the PCM is in the wheel well in the engine compartment. Help please!

I'm not sure on your vehicle, but generally the Powertrain Control Module is located in the engine bay, so you may want to check there above the wheel well.

on my 91 it was behind the glovebox in the car....