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Old 09/20/2016, 10:35 PM   #2
Mosesatm
 
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Location: Spokane, Washington
Joined: Jan 05
Posts: 7,382

Something sort of similar happened to me years ago. I found out that the back of the ignition switch was loose and once in a while it would lose it's connection to the main part of the switch. The car would die, I'd pull over, turn off the key, turn it back on and the car would run fine until the back of the switch jiggled loose again.

You may have a loose electrical connection there or somewhere else, you may also have a bare wire touching the body or frame. At high speed the rushing air may be moving a wire back against the firewall and shorting it out, or the air may be pulling the wire partly out of a connector.
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