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I suspect fuel pump or fuel pump relay problem. Try the relay first they can be tempermental and shut off whenever they want to. then if no luck check wires and connectors for the fuel pump and have it pressure tested.

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17y ago
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Q: Your Merc Mystique appears to have fuel problem you had injectors cleaned fuel filter changed plugs and wires changed it will run and stop after 200 miles but then start right back?
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