This is the first time I have seen a car want this much air. Its a 427, pretty mild cam, 200r4 tranny. When warm, in park, it only wants around 8-9g/s. When you put it into drive, it is wanting 21g/s. It does fine with that transition, but when you go back into park, there is all this extra air that must be taken out, causing a huge surge. LTIT in P/D are zero. When you go into drive, it maxes the IAC out to 310.
I'm stumped and have no idea where to fix this...if it can be fixed.
Thanks