That may be contributing but I wouldnt think that was the whole problem.
Misfiring at idle can be ignition, or O2 sensor bad (which you can watch them both and compare banks together at idle and cruise for diagnosis), vacuum leaks, wrong sized pcv, air leaking in after the MAF but between the throttlebody, and a few others or any combination.
I found that the basic idle and airflow stuff didn't need to be touched much if at all for a smooth idle to develop.
I ran mine at 750 or 800rpm idle all the time, can't remember which one I settled for.
Just don't forget to sit down with a program and watch those upstream O2s and compare them with the downstream O2s and cross-bank. That tells you a tremendous amount.
If you pulled your downstream O2s (
) then you will have to compare cross bank but it is less effective.
