Hi I've got an Audi A3 S line 2.0tdi 170pd and recently I've been having hesitation/flat spot problems around 2400rph. Tried a new mass air flow and just had a service including new fuel filter but still have problems. I drive till my cars warmed up for 20 mins and turn car off and on and problems gone. Car is poor staring too which leads me to believe possibly the batteries low voltage is upsetting the ecu. Any ideas would be much appreciated. Thanks