right where do i start i have a misfire on my rs 2.1 zetec i have found out what it is there is no fuel getting to the 4th injector an only this one i thought it maybe the injector itself so moved it to number 1 but works fine there an number 4 again getting no fuel i know this as when i unplug them one at a time this is the only one that doesnt cut the engine an other 3 do has anyone got any idea why im getting no fuel to it cheers