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Hi, My ford focus 1.6 petrol 2006, has started to have a slight issue. When idle the whole car shudders slightly every couple of seconds and the revs are a little erratic (up and down around 100rpm). I've read lots of forum post about similar problem - but usually much worse where the engine will occasionally stall. My issue isn't currently too bad but very irritating and I'd like to fix before it gets worse. I've read it could be engine mounts, vacuum hose, idle control valve, etc. Any ideas?