Check the TPS output this would cause the problem you describe and also the Amal issue as well as well as causing havock elsewhere.
It's not the base idle, it cannot drop below this it can only be raised above it by air via the ISCV, coupled with the fact this would not have been changed!
Nope the chip is not standard, if in any doubt (The name does not sound familar over here) replace it BEFORE you destroy your engine!
Martin