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The EGR orifices in the intake manifold may plug with sludge. If the truck has high mileage, this may cause engine misfire when first accelerating because too much EGR gas is directed into the cylinders of the unplugged orifices. This makes the mixture lean, which causes a gradual stumble that increases in severity until repaired.

The front brake pads may wear faster than normal. The 4x4 hubs will need to be removed on 4WD models to service the front rotors.

The tachometer sensor may fail; if the tachometer needle jumps around and the transmission has harsh shifts or does not upshift, this sensor should be checked. This sensor is mounted in a cover at the front of the motor.

Wear on the rear axle shafts near the bearings can create excessive play and lead to gear oil leaking past the seals. Gear oil will leak onto the brake backing plate, brakes, and wheels.
The engine is prone to lower engine bearing failure from running the engine at high revolutions. Lack of regular, frequent engine service is also a factor in the failure.
Failure is very common in the ignition module, causing intermittent stalling or a "No start" condition.
Using the correct oil for this engine is critical. Improper engine oil can foam in the high pressure system and not develop enough pressure for operation. Symptoms of this can be hard starting, long cranking time before start, rough engine idle, and a lack of power. Another sign is tiny bubbles in the oil on the engine oil dipstick after the engine is shut off. The additives in the correct oil that protect against foaming can still break down, so changing the oil at the correct intervals is important.
Using the correct oil for this engine is critical. Improper engine oil can foam in the high pressure system and not develop enough pressure for operation. Symptoms of this can be hard starting, long cranking time before start, rough engine idle, and a lack of power. Another sign is tiny bubbles in the oil on the engine oil dipstick after the engine is shut off. The additives in the correct oil that protect against foaming can still break down, so changing the oil at the correct intervals is important.
A lack of power may occur if the turbo sticks.
If oil is leaking from the gaskets and seals, the engine needs to be resealed.
4.0L
The radius arm bushings may wear prematurely due to oil leaking onto the bushings; this causes a loud clunk when the vehicle is shifting gears or stopping.
The transmission vent tube may get bent while the engine is being serviced. This will cause excessive pressure when checking transmission fluid level.
Fuel injector seals can start to leak and allow oil into the fuel system. Symptoms of this might be rough engine idle or hard starting. Fuel that appears gray or black in the filter bowl when changing the fuel filter is another sign.
Fuel injector seals can start to leak and allow oil into the fuel system. Symptoms of this might be rough engine idle or hard starting. Fuel that appears gray or black in the filter bowl when changing the fuel filter is another sign.
Bad motor mounts can damage the engine coolant temperature sensor wiring, causing intermittent full rich conditions.