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my focus is misfiring like mad at all speeds and losing a lot of power?

my ford focus is misfiring alot at all speeds and has lost a lot of power. its a 99 lx petrol. i have changed spark plugs and ive had a new exaust fitted. can any one help me please?
chris, April 2009
WHEN YOU REPLACED THE PLUGS YOU SHOULD HAVE REPLACED THE PLUG WIRES TOO .....

BG, April 2009
If the engine management light is on, I guess it needs a new coil pack. Very common.

John, April 2009
link Click here to see other fixes for Ford Focus LX 99.