Car is a 94 supra turbo. 720 cc injectors just tested for flow. Duel fuel pumps feed both sides of the rail. Center return. 67mm turbo. Heres the issue only spark plugs 1-4 are covered in soot. (rich) 5-6 are normal. Cant understand why cylinders 1-4 are rich and 5-6 normal. Reversed the coil packs and same results. Again had injectors flow tested. Side note I have a Hks DLI system so fire in cylinder should be the same. Any and all ideas welcome. Let the ideas flow.