I'm still working out my list of gremins and figured this might be a clue. When I cold start my blazer I hear 1 to multiple popping noises inside the vortec chamber. I did some searching around and said it might be running rich. My brother noticed it too. He was like strange. If you guys are following my other article. This is on a rebuilt 4.3 with new spider injector, nut kit, fuel pump, filter, etc. etc. No codes either.

Thanks for any help,

Josh