An odd problem and cant work it out! *update with pics*

[Justin14100]

could be that, but it runs fine a lot till a few min a motorway driving, then it starts doing it, so surely the dizzy timing doesnt change?

[PeteG40]

no it doesn't but if its set wrong, might be better with more/less fuel in it.  Check it anyway.

[Justin14100]

no it doesn't but if its set wrong, might be better with more/less fuel in it.  Check it anyway.

is there timing marks? How do I check it?
Where is the knock sensor located? Thanks!

[PeteG40]

you check it with a timing light and the marks on crank pulley.

Knock sensor is on the back of the block - is specific for g40 and is not an efficient knock sensor.