89 300TE Stalling

[Glick]

With the A/C on, when coming to a stop or slowing quickly to make a turn, the RPMs will drop and stall, sometimes they will pick back up but never under hard braking. With the A/C off, it doesn't seem to be so much a problem, however, if I plan my stops and slow gradually, it doesn't seem to stall (A/C on or off). Appears to be more of a problem when the engine warms up. I've replaced the following items: Plug wires (helped immensley since the others were arcing and you could hearing standing next to the car with the hood open), cap, rotor, vacuum hose from idle control to the rubber part under the fuel distributor and the rubber part under the fuel distributor. There is no EGR valve on my model. Any ideas?