i own a 94' XJ40 VDP and the problem began as the car not wanting to start with a cold engine and once the engine would warm up, it would occasionally stall while at crusing speeds in gear. after a couple days of this the check engine light came on with the DTC code 12 (M.A.S.) so i took apart the intake, cleaned the sensor pretty well and reset the check engine light. this fixed the starting problem, and kept code 12 from popping up again but it will still occasionally stall every other day or so, which brought up DTC 69 (neutral/drive switch circuit) i have since reset the light twice hoping it was just an electrical gremlin but DTC 69 seems to be here to stay. Are these problems related? And where could i find this neutral/drive switch circuit?

Thanks All.