Have you ckd the thermal switch? The switch that tells the computer what temp the coolant is. If it is not working properly the computer will not inject the proper amount of fuel. Perform and Ohm test as per your work manual. I if perhaps change the thermostat. There is a passage way from the exhuast through the head that gives the Egr valve the gas frome the exhuast. When I did my head gasket I cleaned it out cause it had a whole bunch of carbon.
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