need help 94 vortex
 

We have been driving this truck for 3 years runs great tune up regularly but all of a sudden 4 weeks ago it started quitting.
No I mean just like it turned off no gurgle or sputter just off while going down the road. wait a min and she starts right up drives for a few min and keeps doing it. took it to our mechanic and he couldn't get a code or find a problem so we kept driving it 3 weeks later it started it a again my wife was on her way home and it just quit running she coast to the side wait a min and it starts right up PLEASE HELP no codes or stored codes no check engine lights nothing. vortex v6 4 wheel drive 100000+ miles

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it is easier to build a child than to repair an adult.......god bless