Powertrain Control Module
It's the computer mounted to the firewall with the three sets of wires going to it. It handles all sensors, warning lights, transmission shifting (if electric), spark ignition, electronic choke..... Pretty much everything electric is handled by the PCM.
Center of the firewall.
A Dodge B250 Van does not have a mass airflow sensor.
Change the canister.Change the canister.
I have a 1989 Dodge B250...it has overdrive
No.
1-8-4-3-6-5-7-2
Yes
Probably, if it's behind the same engine. Electrical connectors may not match, though, since one is OBD II PCM and one is not.
behind glove box or drivers side fender front behind glove box or drivers side fender front
Yes.
Under the hood on firewall in center, above engine.
It is inside the distributor.