Quote Originally Posted by Fast355 View Post
Depends on which MAF he has. The earlier LS1s and Vortec vans use the same 3-pin MAF as the LT1 F-cars and Vortec 350 trucks. Those still had a separate IAT.
I believe mine has the IAT in the MAF because going back over my notes when I reworked my stock harness, I do not have anything listed as IAT but I am going to search further. I did however get my stand alone GM IAT sensor and harness in the mail from amazon today so hope I can get it installed soon.