First things who knows what a WUR does if its faulty
Second once the engine is warm the fifth injectors spray pattern could be wide or intermitten or WUR is still providing too much fuel?
Third if the car run perfectly with it unpluged then its the ISV or controller which we have been going around in circles discussing.
Fourth you think the parts from the other golf is running fine which gives you a
false positive to your current faulty golf. Not much more help mate I can give I can only suggest like I did before bite the builet and buy a new ISV and controller!
Majority people on here change out the ISV and controller and it fixes the issues with hunting after all there is no ECU to complicate things? If it was me, as I test parts out write down what symptoms you get hot vs cold then logically work it out eliminate! Sometimes
YOU are you're your own worst enemy
devil has idle thumbs no pun intended
