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Could be a combination of a number of things causing this issue. Misfiring caused by faulty plugs or wires, a vacuum leak, the injectors need cleaning, higher octane gas should be used for a period of time, at least the next 2-3 fill ups, the throttle body needs to be inspected and thoroughly cleaned etc.
The first thing to do is to have the fault codes read. If you comment with the codes found we may be able to point you in the right direction as to how to fix. Do this first before you spend heaps on all the wrong things.
What year and model is the van? If it's a 97-2001 caravan, then there were issues with the clusters cloking up, usually from an electrostatic discharge. Generally they would still run, just could'nt use the gauges. There is a printed circuit board on the back of the cluster that is succeptable to electric spikes. The most common cause is a spike induced from the secondary ignition cables into the main engine wiring harness. Look at the ignition wires on the rear of the engine, they may be routed too close to the harness under the upper intake plenum. The data bus wires run between all of the modules on the van and any electrical spike can cause this. There was also issues with spikes from the door lock actuators/latches. If they're buzzing when you hit the power locks this may be your problem.
Sounds like you both are having problems with your coil packs. When they start to go bad and get hot, they will shut down on you for a while until they cool back down enough to start working again. They will get progressively worse as time goes on. I believe that you can take the coil packs to AutoZone and have them tested for free. Let me know if you have any other questions, but I think this will take care of you both. Thanks for rating my response and for using FixYa!