This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.
From: Jizhong Wang - 84 Dodge 600 ES
A couple of months ago the car stalled with the "Power Loss"
light. My computer said it was MAP sensor vacuum circuit (code 13). I took the
car to a dealer and was told my computer was faulty - didn't replace it.
Later I found a 6-way connector was loose. It was AIS motor and TPS
sensor connector, nothing to do with MAP sensor. Check the
connections and vacuum leaks before you replace it. BTW, my MAP
sensor is under dash of passenger side, inside the car. It is
two inches above ECM.
<Thomas Z. Zeeb> adds: on Caravan/Voyager, it is under the hood and screwed
into the firewall, just off center to the left, above and behind the belts.
It has one vacuum hose and one three-node electrical connector attached to
it. They range from $70 -$100 US at the dealer. If the MAP is shot, the
engine will shut down after starting. Try disconnecting the MAP, the
engine will then run (rough) in some models.