Clean out the throttlebody really well with some carb cleaner and a rag. I'd also have a look at it with VAG-COM there maybe a problem somewhere else.
Other things that come to mind are the water temp sensor that feeds the computer could ba giving out a duff value causing the computer to lose control.
Does this only happen after being stood over night?
With VAG-COM you can check that the throttle pot is changing smoothly from closed to full throttle.
GAvin
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