It’s a rare symptom on a diesel, unless you drive a TD5. The injector wiring loom is sealed into the engine top. When the seals fail, engine oil works its way along the wiring loom and reaches the ECM where it cause electrical problems, leading to misfire. Check by unplugged the red connector from the ECM and looking for oil on the contacts. Dealers will replace the loom, but cleaning oil from the contacts and loom, and renewing seals should effect cure. Otherwise, suspect a loose fuel connection or solenoid lead on later models.
Case of misfiring on TD5 engines can be caused by engine oil seeping along the injector wiring loom and into the ECM multiplug. Here, it causes electrical tracking resulting in misfire. Remove red connector and look for oil stain in the socket and ECM
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