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I have had several with the same complaint. 2000 Ford FOCUS sputters, rough idle around 750-1000 RPM's but ok when running at highway speeds. It is a hose below the throttle body. It is about 8in down between the fire wall and the engine. This is the part number CO13A 988F-6N664-BA. Getting off is a bit of a task, you might need a flat head screwdriver and pry it off turning the screwdriver clockwise while being up against the bracket/hose clamp and the intake. The hose gets very hot and soft collapeses on itself or blows a hole in it. If you check this and this is not the case you might have a dirty MAF or another vacuum leak somewhere. Hope this helps out a few people that have changed sparkplugs, sparkplugs wires filters pcv valve and pixie dust all over the engine. Cheers!!!

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Q: What would cause a 2001 Ford Focus SE to sputters and start running very rough when stopped at a light or waiting in line but run great otherwise?
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