560sl,
sounds like you have a different problem.

On my problem, the mechanic seems to think that it's either the idle control valve or the module for the idle control valve. Does someone have detailed test procedures for this?

As far as loosing power when it's hot he thinks it's fuel pressure problem??

What's this LAMBDA deal in this car, I've never heard of the word let alone in car. Did some research, but it seems like it provides a perfect balance of mixture??