Golf V5 VAG COM Errors - Cold Start Judder

Hi
Have just purchased a 1999 Golf V5 Auto and recently on cold wet mornings it struggles with power in low revs 1000-2000. When I accelerate when the engine is cold it judders / stutters before finally the power is delivered in a rush. It also splutters on tick over.

When the engine is warm its smooth and acceleration is perfect.

Has anyone got any idea what the problem might be before I start throwing money away guessing. Please bear in mind I am not mechanically minded, so keep it simple please!

Any help most welcome.

Have just go my VAG COM cable and have scanned for errors:

VAG-COM Version: Release 409.1-US


Chassis Type: 1J - VW G/J/B Mk4
Scan: 01,02,03,08,16,15,17,19,22,35,46,56

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 071 906 018
Component: MOTRONIC M3.8.3 AT V05
Coding: 00001
Shop #: WSC 00842
1 Fault Found:
00668 - Supply Voltage Terminal 30
07-10 - Signal too Low - Intermittent
Readiness: 0000 0001

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 01M 927 733 CM
Component: AG4 Getriebe 01M 3953
Coding: 00002
Shop #: WSC 50004
4 Faults Found:
00518 - Throttle Position Sensor (G69)
16-10 - Signal Outside Specifications - Intermittent
00529 - Shareware Version. To Decode all DTCs
35-10 - Please Register/Activate - Intermittent
00545 - Shareware Version. To Decode all DTCs
31-10 - Please Register/Activate - Intermittent
01314 - Engine Control Module
49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 1J0 907 379 H
Component: ABS/EDS 20 IE CAN 0001
Coding: 13504
Shop #: WSC 31414
No fault code found.

Have now cleared my error codes and rescanned after a weeks driving and no errors have re-occured.

I still get a judder/stutter and loss of power between 1000/2000 revs when the engine is cold.

Its worse when its wet, but always goes one the engine is warmed up after 10/20 miles.

Any one any ideas?

Try changing the coolant temp sensor.

Will try replacing the sensor.

Is it an easy job? and what tools do you need?

Thanks

Easy.... scewdriver and pliers.
Get a new clip and "O" ring when you get the sensor, you can bet if you don't you'll break the clip...

Have now changed the coolant temprature sensor and no change.

Still getting the power loss/ judder at around 2000 revs

any more ideas?

Happy New Year!

Clean and re-set the throttle body

Just before I installed a new MAF, I checked the ignition leads going into the coil pack

One of them was cracked and I am replacing the coil pack monday, so fingers crossed

will update if this worked

Coil pack amp failure can cause this. It is the box on the bulkhead.

Fitted a new coil pack amp and now runs smooth as silk
Thanks for all the advice