I have the same problem, Im working on it. It seems related to the following items on the car:
1) EGR System
2) Engine Coolant Temp Sensor - this is the fat sensor on the thermostat housing.
3) TB - check for dirt and loose vacum hose.
4) There is a switch on top of the compressor, mine is loose and rusted.
The A/C on these cars play a part on the MFI, there could be a problem with the ECU. In my case Iam going to replace the ECU to check the system.
I will try to get the ECU in the car this saturday, but it will definitely be installed by next week.
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