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Help : injector wiring

  pb ph2 172
Right I recently had a misfire occur on which the diag showed up that injector on cyl 2 was open circuit / short positive earth also said cylinders spark plug was black with soot
ive tried new injector , plugs , leads , coil pack then even swapped the injector with cylinder 1
Problem was still there
ive now set about stripping back the wiring loom but so far can't see any breaks
however with the loom all pulled apart the car appears to run perfect
when I first had the problem it was idling rough
but when I changed all the parts it idled perfect and only missfired under load / under acceleration but not at say 50mph cruising
after fiddling with wires it's perfect
has anyone else had this problem before