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Follow the upper rad hose to the thermostat housing. It will be there. There are two, one is the ECT (engine coolant temperature SENSOR) and the other is the temperature SENDING UNIT (input for temp. gauge ONLY).
The first code is for the Diesel particulate filter sensor and the second is for a high temperature on the EGR temperature sensor. Your truck may need a new Air filter and I would try doing that first. The EGR temperature may drop if the Intake air flow is better.
Have someone clear the computer with a scanner at Autozone, Oreillys, or Advance where they will scan for free. Also ask scan guy to get a reading on curb idle speed. You may be idling too low to have good exhaust flow. If the EGR temp remains high, you may have a blocked exhaust or a faulty sensor.
I hope my solution is very helpful in fixing your truck.
This sounds like the ignition control module, when it heats up it dies, remove it and have it tested at an autoparts store,this is where i would start.heres a few picture to show you where its located, its on the side of the distributor, hope this helps.
what type of cyl. problem, compression ,miss fire, if it is a comp. issue more than likely you have a nead gasket problem,you can check this by performing a cyl.compression test you can purchase the tool the other two issuses are simplely fixed by replacing those sensors this could very well elimate the other problem