Having a pain problem after change timing-belt, water pump, air-filter on my S3 8L AMK. the symptom pretty weird, idle rpm goes between 1k or drop to 300 rpm (almost dead). feel very jerky when accelerate to 3k , can't accelerate when reaching 4-5k. When we try to un-plug the MAF sensor and car can accelerate smooth as usual except 2 light on dash come up (engine & ESP) My Garage think MAF sensor might dead which i see most people had the same problem by reading the forum. Have try 2 different brand new MAF sensor change but problem still exist, then try change coil pack but nothing help. try Vag-com to see any DTC, see nothing come up special except below 1 Fault Found: 16486 - Mass Air Flow Sensor (G70): Signal too Low P0102 - 35-10 - - - Intermittent Readiness: 0010 0101 This DTC show when car in MAF sensor un-plug condition which we think is normal. It show no error when we plug MAF sensor back. The car was Revo stage 1 tuned in previous owner before my hand and pretty much are standard without other modify (engine part) . Any suggestion or advise are deeply appreciated and welcome, hope can be a hints for us to trace what problem it is now. Currently i force to un-plug the MAF sensor when using the car but scaring it can't use in long run as ECU can't reading any air-flow figure that might harmful the engine if keeping for long without fixing.