Can someone help me out trying to see what i need to swap from maf to speed dinsity on my 1988 iroc z28 305 tuneport,and where to get parts from.can i get harness from junkyard out of a 1990 to 92 Z28 ,and computer and chip. any help. car runs rough at idle and dies ,showing codes 33,34,and 36 hard to find a good maf these days