this pug came in yesterday that when you gave it a light throtle it goes to stall on you, I can drive through it. this is a motronic ma 3.0 single point injection. the fault codes are Mixture regulation [higher value reached] "" " [lower value reached] Oxygen sensor short circuit to ground I cannot clear codes with engine on or running, if i disconnect idle speed reg & oxygen sensor it makes no differance to the codes. Had brake out box on and all volts and earths are fine & both oxygen sensor, heater circuit & idle reg are working including throtle pot. I intend today to start pulling the loom apart now the car is cold, I have tryed another idle reg & ecu any ideas as I have not come acoss this fault before, phone no is 01827 311332. ray