My old man had a car with a 5 link with the top arms running backwards. It had rose joints on all the links and he found that it bound up on articulation due to each end of the axle housing trying to twist opposite directions.
All fixed by putting rubber bushes in the top arms to allow some deflection
If it works the same as a 4age one have a look at this:
http://www.mr2.com/forums/threads/104536-4AGE-high-idle-FIXED!-idle-air-control-valve-readjustment