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How do I stop my engine from running rough?

My engine runs rough at idle and low RPM. Seems to go at RPMs greater than 2000. I changed out the spark plugs and wires. There seems to be a lot of noise coming from timing belt.

2001 Ford Focus
2.0L DOHC
Abbott, June 2008
If the engine sounds as if it is running on, say, 3 cylinders then it might be the coil pack. £37, held on by 4 star screws, easy to do yourself.

Bobby, June 2008
link Click here to see other fixes for Ford Focus.