multible missfire and fuel trim bank 1 system too lean golf 1.6

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sorry didnt know were else to stick this

basicly a friend has got a golf 1.6 auto mk4.

it had a bad missfire so he got the leads and plugs changed and ws told cyl 4 plug was dry and cyl 1 was very sooty and dirty

this has resovled some what the lumpy idle and misfire on reving, but he still gets the same problem.
so i cleared he codes and hes not sure if this made the idle and revs better.

it idles ok, and then goes lumpy, but does rev freely now in a fashion, but the knock sensors are still sensing a missfire in cylder 1 and 4

hes yet to travel home today to find if the problem has been cleared
misfire on cly 1 and 4 and some time 3, and also fuel trim bank 1 system too lean

what can be at fault here? injectors, fuel pump? does this sound like a fuel delivery problem? how can i check if it is this
other then that i suggested compression but not entirely sure

unfortantly i only have the freeshare version till i gather the cash up for the real deal



VCDS-Lite Version: Release 1.2
Monday, 30 September 2013, 09:36:07.
Control Module Part Number: 06A 906 033 BL
Component and/or Version: SIMOS33 1.6l 2V 00AT4578
Software Coding: 00033
Work Shop Code: WSC 01271
VCID: 6AA741AB0567
Additional Info: WVWZZZ1JZ3W147765 VWZ7Z0B5430645
6 Faults Found:
16687 - Cylinder 3: Misfire Detected
P0303 - 35-10 - - - Intermittent
16555 - Shareware Version. To Decode all DTCs
P0171 - 35-00 - Please Register/Activate
16555 - Shareware Version. To Decode all DTCs
P0171 - 35-00 - Please Register/Activate
16685 - Cylinder 1: Misfire Detected
P0301 - 35-10 - - - Intermittent
16688 - Shareware Version. To Decode all DTCs
P0304 - 35-10 - Please Register/Activate - Intermittent
16684 - Shareware Version. To Decode all DTCs
P0300 - 35-10 - Please Register/Activate - Intermittent








VCDS-Lite Version: Release 1.2
Monday, 30 September 2013, 09:38:36.




Chassis Type: 1J - VW Golf/Bora IV
Scan: 01,02,03,08,15,16,17,19,22,29,35,36,37,39,46,47,55,56,57,75,76

-------------------------------------------------------------------------------
Address 01: Engine Labels: 06A-906-033-APF.LBL
Controller: 06A 906 033 BL
Component: SIMOS33 1.6l 2V 00AT4578
Coding: 00033
Shop #: WSC 01271
VCID: 6AA741AB0567
WVWZZZ1JZ3W147765 VWZ7Z0B5430645
No fault code found.
Readiness: 1110 1101


-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01M-927-733.LBL
Controller: 01M 927 733 LK
Component: AG4 Getriebe 01M 4985
Coding: 00000
Shop #: WSC 00000
VCID: 847B8F138703
No fault code found.


-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: None
Controller: 1C0 907 379 M
Component: ESP FRONT MK60 0102
Coding: 0011266
Shop #: WSC 01271
VCID: 341B9FD31723
1 Fault Found:
01314 - Engine Control Module
013 - Check DTC Memory - Intermittent