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Vacuum leaks will do this. You didn't say what year it is but anything from 82 on will have the air mass meter- any leaks between the AMM and the intake valves causes idle trouble as it allows unmetered air into the system.
Look for holes in the black plastic intake hose from AMM to throttle body, as well as possibly a bad intake gasket or injector seals. Any hoses that aren't secured or have cracks will do this too.
An intake gasket is only about $3, injector seals are $2 each, and the air hose cost me $14 last month...
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Rob Bareiss, New London CT ::: '86 244DL- 215K, 87 244DL- 230K, 88 744GLE- 198K, 91 244 180K
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