fault codes

[Mattyb]

hey all i am having a few problems with my a8 lately,

it some times cuts out and today i had a new problem where the engine is reving up and down from about 800rpm to about 1200.

i cleared my fault codes a few days ago and have done another scan today and this is what iv got,

any help will be appreciated as im new to world of vag.

Saturday,20,April,2013,13:33:45:41965
VCDS Version: Release 11.11.5

Address 01: Engine Labels: Redir Fail!
Control Module Part Number: 4E0 910 401 J HW: 4E0 907 401 B
Component and/or Version: 3.0L V6TDI G000AG 0020
Software Coding: 0011973
Work Shop Code: WSC 02313 785 00200
VCID: 224B3171FD6C1C08178
3 Faults Found:

17984 - Right Engine Mount Solenoid Valve (N145)
P1576 - 001 - Short to Ground
Freeze Frame:
RPM: 0 /min
Torque: 214.5 Nm
Speed: 0.0 km/h
Voltage: 11.93 V
Bin. Bits: 1
Bin. Bits: 1
Bin. Bits: 1
Temperature: 18.9°C

18279 - Transmission Mount Valve 2 (N263)
P1871 - 001 - Short to Plus
Freeze Frame:
RPM: 0 /min
Torque: 214.5 Nm
Speed: 0.0 km/h
Voltage: 11.93 V
Bin. Bits: 1
Bin. Bits: 1
Bin. Bits: 1
Temperature: 18.9°C

19591 - Intake Manifold Runner Control
P3135 - 001 - Lower Stop not Reached
Freeze Frame:
RPM: 1092 /min
Torque: 132.6 Nm
Speed: 2.2 km/h
Voltage: 13.68 V
Duty Cycle: 88.8 %
Duty Cycle: 80.9 %
Duty Cycle: 80.9 %
Temperature: 74.7°C


Readiness: 0 0 0 0 0

im not to worried about the top 2 at the minute unless they could cause my problem, but i think this is unlikely

its bottom code (intake manifold runner control, lower stop not reached) that i believe is the problem.

thanks for reading

matty