It only does it really when cold, its hard to explain but it coughs and splutters a bit until its warm any ideas what this could be??? Its a an esc cos. I have changed the plugs i havent changed the leads but there not that old really.

 

my sapph does the same

 

Plug gap ?

 

Mine also does this, even after all the sensors were replaced !! hope someone can help ........

 

It could be plug gap, but why would it do it only when cold?

 

havent seen any cossies or old cars in general that aint rough for a while when started from stone cold...

 

Had same problem with mine.Does it stop when you disconnect the idle valve? I used to do this with mine to cure it, but in the end it was the blue temperature sensor at the back of the head.Changed that and it never did it again!

 

my plugs are set to 6and im running 330bhp etc