GM-GMC: GMC 454 Code 32 - BARO?, vacuum lines, baro

Question
I have a 1990 GMC 454 in a motorhome, and the check engine light keeps coming on.  There has been no problem with the engine when this happens.

We replaced everything but the BARO.. Do you know what it looks like, and where we might find it?

Thanks,
Joe

Answer
The BARO or MAP sensor may look like the photo in the following URL:  http://www.rockauto.com/ref/ACDelco/Detail.html?213-185.jpg

It will have a vacuum connection from the intake manifold and an electrical connection to the computer.

It may be on the engine or it may be on the fender or firewall.  I would try to find it by tracing vacuum lines from the engine.