I have a 96 plymouth breeze. The car will turn off once it is warmed up, but it doesn't overheat! So I wait 1 1/2 hours, (45 minutes on cool days), and starts right up like nothing ever happened.
Could be a failing ignition coil or ignition control module. When it dies check for spark. Sometimes when a coil or control module gets hot it breaks down but works perfectly fine when cool. HTH. -Jim
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