Hello, have installed the 850 with immobilizer pen from VDO 4638-9162608-03. Don’t sprinkle any more. With a long start then a light 1-3 cylinders run out and then again. Ignition sparks are on. Injection nozzles only slightly inject a then no more at all? Petrol pressure 3 bar. I guess now that it is at the immobilizer, or do I see this wrong?