I currently have a capri 2.8 v6 on dgas carb in my cortina, when we rev it, it sounds like it's about to cut out. We have tried changing the timing so it's spot on and then it doesn't start... We have tried setting the mixture and idle and still nothing.

When the two flaps on the carb are closed then it's fine, when open thats when it happens...

Would anyone have any ideas what could cause this? Need anymore information let me know.