HELP -1996 Dodge Caravan loses power on hiway

Took to shop and replaced fuel pump, fuel filter, relay and a complete tune up.
On 3 occassions while driving on hiway about 70mph with a/c on, completely
loses power....like fuel pump going out so no gas. But when car sits for 30 minutes, it will run fine as long as no air conditioning being used.
1996 Dodge Grand Caravan SE V-6, 139,000 miles.
Any advice???
L Page
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If the fuel system was suspected it would not just cut right off, it would slowly loose power then cut off, so I would see if there are any fault codes in the computers memory first.Is this a 3.3 liter
Glenn Beasley Chrysler Tech
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