I just replaced the injectors in my cosworth. The car runs much better but I am still getting misfires from group 2 (#3&4) I am listening to the injectors with a stethoscope. The car will run perfect for a minute or two and then It runs rough. The 3 & 4 injectors sound weak and like they are sending a morse code when it goes into it's rough mode. I thought I read about someone having a similar problem in one of the CVOA magazines. I'm still looking for the article. In the mean time anyone have any ideas? Thanks much