What would cause a 2002 Focus Se to be idling rough and have power lost through all 5 gears?

* Vacuum leak: A vacuum leak can cause a car to idle rough and lose power because it allows unmetered air to enter the engine. This can cause the air/fuel mixture to become too lean, which can lead to misfires and a loss of power.

* Fuel injector problems: If a fuel injector is clogged or not working properly, it can cause the engine to idle rough and lose power. This can be caused by a variety of factors, such as dirt, debris, or a bad electrical connection.

* Spark plug problems: If a spark plug is worn out or damaged, it can cause the engine to idle rough and lose power. This can be caused by a variety of factors, such as age, wear, or a bad connection.

* Ignition coil problems: If an ignition coil is not working properly, it can cause the engine to idle rough and lose power. This can be caused by a variety of factors, such as age, wear, or a bad connection.

* Catalytic converter problems: If the catalytic converter is clogged or damaged, it can cause the engine to idle rough and lose power. This can be caused by a variety of factors, such as age, wear, or a bad connection.