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My 1999 1.4 focus has been running sluggishly over the past month and I got round to look at it today. I removed the cover for the plugs and was greeted by condensation over the underside of the cover the plugs have a divider between 2 & the sensor next to plug 3. In the bottom of plugs 1&2 it is dry but in the bottom of plugs 3&4 there is what I can only describe as a mush about 3mm deep the same colour as the coolant. Q. is the sensor something to do with the cooling system and would a replacement seal rectified the mush problem and would a new set of plugs rectified the sluggish running?