If I missed last weeks parsha which parsha do I do first this week? Tzav or Vayikra?
You are asking a very good question. It is controversial which parsha should be said first, the makeup one or this weeks parsha. The poskim seem to say that it is better to say the makeup one first so that the ma’avir sedra will be in order.
Maharsham 1- 213, Btzel Hachochma 1-9, Kaf hachayim 265-5,. Se Halichos Shlomo 12-36 in the name of R’ S. Z. Auerbach zt”l that L’chatchila one should read the missed parsha first Gam Ani Odecha 1- pg. 11 in the name of R’ C. Kanievsky that L’chatchila one should read the parshios in order, Ohel Yackov 5-11, PIskei Teshuvos 265-8.