So I have a 2004 Volkswagen jetta gli. It has a stage 2 eurocustoms tune with a ko4. While it had a ko3 it pushed 20lbs now it only pushed 12 with the ko4 so I got the Bosch 440cc "Green Giants" injectors and now my car wont idle properly. Do I need a tune for these injectors or do I need to upgrade something else. Taking any bit of suggestions.