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Sounds to me like you have a vacuum leak somewhere. If you search the board you'll find a bazillion posts about this. I've had the same problem and these are things I've changed or checked.
1. Injector seals
2. Intake manifold gasket
3. complete Throttle body service
4. All Vacuum hoses ( 2 for Idle bypass, 2 for flame trap, main intake hose between AMM and Throttle body, 2 small hoses off side of throttle body that go to charcoal tank, and brake boost vacuum hose)
5. Check or change water temp. sensor (for computer not guage)
6. check air mass meter
7. check preheat hose and airbox thermostat(if thermostat is stuck open it could fry the AMM by letting hot air in all the time, assuming the preheat hose is connected.)
There are procedures to check for leaks using a propane torch(unlit w/ gas coming out). I've never done that but apparently it works really well. Check the board for that one.
It might help some if you could be bit more specific about how the cars runs not only at idle but also while driving, accelerating etc.
Let us know
Marty
p.s. Of course there is the very high likelyhood that you have a bad wiring harness(very common for 80-87? 240's) in which case none of the above will completely solve the problem, though some of them may improve it a bit.
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