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Hi All, I own a 1.8Si Escort Zetec, it has a superchip and a fse boost valve, mention incase it a problem?, but she is misfiring and losing alot of water? I have changed most of sensors but have a feeling it could be head gasket? It only misses in low revs? As you put down accelerator. It clears higher up revs? Any help would be appreciated it had a new head gasket a year ago when head was rebuilt. Kind Regards