HAVE A PROBLEM WITH MY 855 T5 (1994). I START THE ENGINE AND I'VE GOT GREAT DIFFICULTIES WITH ACCELERATING IT (THE IDLE IS INCONSTANT). I HAVE READ THE CODES 231, AND SOMETIMES, 143 AND 212 (ON A2 SOCKET). WHEN I CLEAR THE CODES, EVERITHING COMES BACK TO NORMAL, BUT IF I RUN THE CAR FOR SOME TIME IT...