Since it’s shutting off/running after two minutes that tells me there is an issue with the computer using O2 sensor signal. The signal is incorrect and the computer can’t figure out correct amount of fuel. So you could have a bad O2 sensor.
The condensation (water and white smoke in exhaust) actually worries me. Is the van using coolant? You could have a blown head gasket leaking coolant into one or two cylinders. Which can cause water in exhaust, and drivability issues like you describe.
I would pressure test the cooling system. And the O2 sensor. You should also pull your spark plugs, if you have a head gasket issue the plug on the blown cylinder will be cleaner than the others.
1991 Dodge B250 Zephyr Conversion. "Bi-frost" 74,000-ish original miles and counting.
- 318TBI; has headwork and other bolt on upgrades. Runs strong and smooth!
- Powertrax locker
- Rear air springs, rebuilt suspension, steering stabilizer.