PCM replacement

You can get a used one. However, it has to have the same exact part number. If you get a different one, it won't work. As far as reprograming, it shouldn't need it. Just make sure the battery is disconnected until you have the new one installed and plugged in. Then you can reconnect power.

No start condition
with key on you should have check engine light on if not check fuses and wiring and ignition switch
if light on, light should go out when engine is cranking if not suspect, check and replace crank position sensor

check for spark, check for fuel and fuel pressure, not sure how to do your checks

Check fuses (cigarette lighter fuse)
cycle ignition key on off three times ending with key on read codes in the odometer area

Post your responses to the original thread so the person helping you will be notified and can continue the conversation.

Year old gas might cause starting problems but typically, if the engine starts, it should still run okay. Run that gas out then put fresh fuel in. If the misfire continues, search for a different cause.

You need to get it programmed. The theft deterrent is likely locking you out. I don't know why you changed it in the first place but you still may have another problem that the computer didn't fix also.

Hi guys. Let me butt in and add a tidbit. If your van has the factory anti-theft system, use the key to turn the lock cylinder in the lift gate. That will program the Engine and / or Body Computer to work with the anti-theft system and allow the engine to run. If your van doesn't have the factory anti-theft system and you installed a used Engine Computer with that programming, it can't be "unprogrammed". You have to use a computer from another van that did not have anti-theft programming.

When it's in theft mode, the engine will typically run for just two seconds, then stall.

You need to use a multimetre to test that you are getting a voltage coming down the wires from ECM to the coil pack. I do not have the wiring diagram at this moment I am looking into this? Will also check what voltage should be coming down the wires? In the meantime just check that you are actually getting an electronic pulse down the wire