lambada sensors will be telling the ecu weather the mixture used is rich or lean so they could affect it. be sure to check you throttle postion sensor wirse fully though. i just rebuilt an i4 lump and all was totally fine apart from the wires goign to the coilpack for cylinder 1 and 3, they had compleatly fallen apart inside the heat insulation. may be worth you checking the wires from the plug to the ecu plug with a muiltimeter for continuity