Have they checked and rechecked the cam timing? Maybe they put the belt a few teeth out on one cam, that would cause a similar issue.
You should not be mixing and matching electrical and injection parts, just use all of your original ones. If its running lean use a fuel pressure reg to up the fuel pressure. The injectors between FP and FS may run different impedance, especially if they were built in different years or series car, the ecu will not be able to control injectors with an impedance that varies too far from stock ones.
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