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What is wrong when the service engine soon light comes on and truck running rough?

When the service engine soon light comes on and the truck is running rough, it can be due to a number of different issues, including:

- Engine misfire: This can be caused by a variety of factors, such as a faulty spark plug, bad ignition coil, or worn spark plug wires.

- Fuel injection problems: This can be caused by a variety of factors, such as a dirty or clogged fuel injector or a bad fuel pump.

- Air intake problems: This can be caused by a variety of factors, such as a dirty or clogged air filter, a faulty mass air flow sensor, or a vacuum leak.

- Exhaust problems: This can be caused by a variety of factors, such as a clogged catalytic converter, a faulty oxygen sensor, or a damaged exhaust manifold.

- Emission Control System Problem: This can be due to a variety of reasons such as a faulty EVAP system, O2 sensor issues or a catalytic converter problem.

If the service engine soon light is on and the truck is running rough, it is important to have the vehicle diagnosed by a qualified mechanic to determine the cause of the problem and get it repaired as soon as possible. Continuing to drive a vehicle with a rough running engine can cause damage to the engine and other components of the vehicle.