hi got problems trying to get my 1995 RS2000 engine to run

ive recently put the lump into a mk 6 escort van. But only had an engine loom when got the engine (last minute decision) now i have an engine in, it turns over theres spark but the pats unit seems to be cutting off the power to the injectors the wiring seems to have been altered at some point the key readers there and wired up but in all the black wires to the pat unit some seem to be cut HELP!! i need a new loom i think