UpdateDepends on the scanner you are using, mine generally reads them a tiny bit high, like 4-5.5% but looking at voltage instead of % it shows correct, the important thing is it not fluctuate too much between engine off and engine on.
I put jb weld on the crack on the manifold and no change i checked battery charge at surge stayed between 14.4-.6
and then checked the ac voltage with the red cable in the fuse box and - terminal on battery and reads .36-.47
Update. When I cover the IACV HOLE surging stops. When I cover the other hole next to it surging stops. When I cover both car dies after like 5 second
Also how do I go about checking vacuum lines there’s only the vacuum which line and the pcv line right? And when disconnect the line to the vacuum switch it has suction and the search changes but when I disconnect the output side of the switch there’s no vacuum do I have a bad vacuum switch? This was done while hot when car is surging