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I recently experienced the same problem with my 89 Caravan 2.5L turbo. When I moved to Texas this spring and started using the A/C, I would have the exact same symptoms as described by Delivery Driver minus the clunk. Eventually they problem started happening whether the A/C was on or not.
I replaced the fuel pump and filter, Distributer cap, rotor, plugs, wires and pickup coil (on a tip from a mechanic).
Now I have not problems as long as I don't run the A/C. When I turn on the A/C at idle, the engine seems okay, but as soon as it is revved over 2000 rpm, the engine starts to choke and sputter. When I drop the rpm or turn of the A/C, engine returns to normal.
Unfortunately, after running the A/C and then shutting the car off, it wouldn't restart until after cooling off for a while.
I though maybe these specific details might trigger an idea with some of the experts out there.
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