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Fueling issue running far to lean, choke makes the circuit richer so it will run , lean running causes over heating and serious engine damage if its running red hot, check the plug for white burnt or blistering will show lean running. Compression test to make sure the piston ring and barrel are not damaged over 110psi. Is the exhaust blocked restricted or dented ?
This most likely is the cylceing of the glow plugs. Depending on the temperature they will cycle up to 30 seconds even after the truck is running. If the light continues to come on and off after 30 seconds you may have a bad glow plug relay.
the ignitor should glow bright orange.it sounds like you have a weak ignitor but if the flame lites within 20 to 30 seconds it sounds like it's ok,it could be braking down though when it gets hot,it doesn't matter if it glows,it has to be putting out 3.2 amps,if you have an amp meter with a clamp on it you can read out the amps,if the broiler works ok i would change out the ignitor,then follow the tube down to the bottom and stick a paper clip in the orifice hole where the gas comes out and make sure that's clear,also there's a shutter on the tube to adjust the air flow,see if it's closed,it's usually almost wide open,check the tube to make sure the ignitor didn't burn a hole through it.i've found tubes with holes in them from a lazy ignitor,most of the time if there's a problem it will be the ignitor
Check the glow plug.
Take off the bottom front panel, push the start button and look for a red glow. This glow plug is about the size of your little finger and is hard to see when it's off but you will see a red glow if it's working. No glow, replace the glow plug.
If it glows for a few seconds then goes out then the solenoids on the gas valve should be checked with an OHM meter.
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