engine rpm surge. help needed.

[fixkick]

so true that, he IAC llocated there stinks, because the screws always seize, hope not you.!! (steel screws , aluminum body, love to seize, like motorcycles do.

put a propane torch to screw heads cycled hot then cold can un-stick them (a trick that cracks the rust bonding... (but dont let the body go over 200f.)
by 100.. (redacted my comment)
so you got leaks.