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i had something similar, ended up being one of my ignition coils onits way out. The sound was continuous and catalyst started o over heat
 
I get this on my leon sometimes, almos a back firing when it is cold and quite a stutter. only happens when its cold

I think its one of the coils on its way out
 
yes, does almost stall sometimes, give it a quick rev and it seems fine :confused:

yeah, give it a hard rev and it goes away:)

I have 4 new coils on order so will swap them out when it goes in for the turbo build and remap
 
with the blowers on, can you smell rubber burning, does your engine mangement light flicker?
 
with the blowers on, can you smell rubber burning, does your engine mangement light flicker?

no, certianly not on my issue mate

but then my engine management light is permanantly on due to my race cat:D
 
finally some1 got the same noise as me! have you actually established what it is? only happens on really cold mornings