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NO power, won't start or stay running, can't get above 20mph
I have a problem with our truck.
Truck is a 2002 F550 7.3 diesel dump truck. Problems started a few weeks back.
It will start cold (sometimes need to keep it plugged in), and run okay for a few minutes, whether you give it time to warm up or not. However, it seems usually after a half mile or so of driving, it dies.
Starts to *severely* bog down. No amount of stepping on the gas pedal make it move any faster or seem to really change the RPM's at all. Then it dies, and won't start back up. It tries to, but doesn't actually start.
Fuel filter replaced maybe a week ago. Truck has about 40k miles on it. Supposedly glow plugs were replaced last year (was told that, not sure if it's true. My brother's truck)
Glow plugs, fuel injectors, fuel pump??? The 'purge valve' seems to work, and if I open that, it seems more inclined to starting after closing it back up, but still it will bog and die again.