Hi! My Passat 1.8T (Free flow pipe, Upsolute chip) has a very slight "stutter" i.e. not enough to be called a misfire under light throttle semi loas citcumstances, plus a reluctance/feeling like it's holding back on a hot day - approx. 30 degrees C. Workshop has picked up an error code of the MAF (Mass Airflow Sensor), saying "Low input voltage or something similar. He says my MAS is knackered. Does anyone know what symptoms one may experience with this problem? Many Thanks!