Microplex ECU location?

It is in the left side wheel well, you remove the wheel well liner, it is mounted to frame rail under the oil cooler. The fuel ecu is in the right side of the trunk behind the carpet lining panel.

 

Not sure why you are needing to "find" that box, it is pretty binary, either it works or it doesn't, and failures are rare as it has a pretty simple circuit board inside. Unless you hosed it down with a pressure washer while cleaning the engine....

There is a vacuum hose that attaches to it, and connects to the intake plennum. Make sure that small diameter hose is in good shape, as many have never been changed, if it says SAIG on the sides of the hose, it is most likely original.

 

Ah yes, very interesting road trip!

If you think you heat damaged the ECU, here is can you test it.