Not likely. A quick way to tell would be to pull the generator fuse What's your idle voltage? Is it jumping around significantly?

Put your meter on AC voltage and measure across the battery terminals with the car running and make sure it's under .5v AC

Do you still have the stock IAC hooked up? Did you run vacuum lines to any of the car's stock emission controls that may be causing problems? Is your idle jumping between different VE bins with different values? All this can cause a bad idle.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician