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If the engine shuts down at highway speeds I will suggest there is insufficient fuel pressure and a failing fuel pump. If all is running well at lower speeds that do not demand a large supply of fuel but the problem shows at higher speeds demanding more fuel supply this is a fuel supply problem. We had one that would vapor lock like that on hot days. the fuel line runs right along the exhaust. I'm assuming it starts back up in 15 to 20 mins. you can install a piece of sheet metal where the fuel line comes close to the exhaust

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17y ago
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Q: Why the engine would just shut off while driving at 50 or more miles an hour in a 1990 Dodge Caravan. I have to immediately find a safe place to pull over.?
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