Hi Guys my first 'how to' here, hope it helps someone.
I found that the engine light came on and after the engine (1.4i Petrol) was run for a few mins, it would either start 'hunting' (revs bouncing up & down) or turn off, this is after the autochoke went off, this would then cause a little difficulty restarting.
I did a Vag Com scan and found:
1 fault found:
17566 - Manifold Pressure Sensor (G71): Implausible signal
P1158 - 35-10 - - - Intermittent
Readiness: 1010 0101
SO I had a look around at the sensor and wiring, it all seemed to be ok, so unable to test the sensor without changing it, and not having a spare, I decided to do basic checks, (it's funny how people jump to conclusions, spend cash, then find afterwards that they should have checked basics first).
Having a look around and feeling the full length of the pipe that the sensor is fixed in, I discovered that this pipe had been rubbing against the brake pipe next to it, and it had gone through (out of sight) causing a hole in the pipe!.
SO, to remedy this, I cleaned up the pipe and used good old self Amalgamating tape (every tool box should have this, it's very useful) around the hole in the pipe, creating an air/water tight seal. Don't be tempted to use insulation tape as this usually undoes it self after a little bit of heat, and is pretty useless in greasy situations. I then cleared the fault code using Vag Com, and Valla!.. idling normal, and no fault found!..