I've got a 54 plate a4 avant 1.9 tdi auto multitronic with 90k on the clock. Recently had a big service at ivc in Leeds including all belts and fluids etc etc. Anyway, driving home today and the car suddenly would not rev. Looked at the dash and the esp light was on and the coil light was flashing. Came to a stop at the side of the road and switched the car off and on again and this cleared the lights but as soon as I placed my foot on the gas the lights came back on again and the car would not rev - just ticked over at 900 revs as usual. The aa came out and the car was showing no faults so had to be towed to a local garage. Anyone any ideas???