Hi my A160 sa 1999 has started running really badly. It did it about three weeks ago and cleared up after a day. This time it is all the time. It starts fine and in neutral revs ok but as you start driving it keeps cutting out and stalling, shunts, and misses and runs lumpy. I had it plugged in and checked last time and they said the lambda probe was outside its parameters. Does this sound like the MAF / ECU unit? Help please, new to A class and Mercedes so dont know here to start.