I have a 2002 Ford f150 and I just changed the heater core took down the dashboard and when i put it back together it starts but only stays on for a few seconds then shuts down.
Oh brother sounds as if you may have a short, this is what happens when you try to save a few dollars
The guy came for help, not criticism. Who isn't trying to save a buck anyway? Bmorgan, this may be a a really long stretch, did the wires to the fuel cutoff switch behind the right front rocker panel get loose or anything? I don't know if it could even cause your symptoms, but it's an easy check.
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