I cleaned my throttle body and iac the other day and now for some reason in park or neutral the truck wants to idle high as hell for a minute like 1500 rpm then after about a minute or 2 drop to about 500 and sometimes even die...but it runs just fine while in drive or reverse....WTF i was wondering if turning the black **** on the iac would make this effect...idk bout yall but i dont think it would be there if it didnt do anything so i thought maybe i accidentally turned that **** the wrong way and that was whats causing the problem....any suggestions would be great thanks