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I would reccomend going to the local parts store and get the car scanned, usually for free. The code is a four digit number with a "P" at the begining.
Common problems are wiring to the TB(throttle body), dirty TB bore, and adaptation of the throttle.
If the battery has had issues or been completly dead, the computer needs to relearn how to react, this is called Adaptation. It requires a VW capable scantool...
The car will idle poorly, stall, etc... and the Check Engine Light...
If you get the codes, let me know as it will really narrow it down.