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I would bet its from the p2000 code, do you idle your truck?
P061A-ETC LEVEL 2 TORQUE PERFORMANCE
Possible causes:
SOFTWARE REVISION/TSBS
COOLANT TEMPERATURE SENSOR
EXHAUST MANIFOLD PRESSURE SENSOR
INTAKE MANIFOLD PRESSURE SENSOR
BRAKE SWITCH
ENGINE OR FUEL MODIFICATIONS THAT EXCEED OEM SPECIFICATIONS
ACCELERATOR PEDAL POSITION ENSOR
ENGINE CONTROL MODULE (ECM)
P2000-NOX ABSORBER EFFICIENCY BELOW THRESHOLD - BANK 1
Possible causes:
MASS AIR FLOW SENSOR
O2 SENSORS
EGR LEAKS
BOOST SYSTEM LEAKS
USE OF HIGH SULFUR FUEL
TAMPERING OR REMOVAL OF THE NAC
DEGRADED OR POISONED NAC
EXHAUST, EGR OR INTAKE LEAKS
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Mopartech, owner of Alliance Diesel, diesel performance and repair.
2002 2500: 6speed, stock for now 
2001 2500: 5-speed, 150hp sticks, gdp pump, smarty (revo), adrenaline/pulse, SO Injection pump 400/991 5/10/2008 (pre revo and pre adrenaline).
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