CRANK SENSOR APPEARS TO BE WORKING AS I CAN RUN THE CAR FOR 5-10 MINS ON EASY START,(DID THIS LAST NIGHT TO FLUSH OIL ,SUSPECTED POSSIBLE PUMPED UP FOLLOWERS,DRAINED OIL AND REPLACED WITH CORRECT GRADE AND NEW FILTER,PLUS CAR WILL NOT SPARK WHEN CRANK DISCONNECTED.ANY CLUES AS TO WHAT GETS CUT ON IMMOBILISER?