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ac help needed

Hi. As the summer quickly gets underway, I'd like to coax my a/c into
functioning. The car is an 86 5000 cs turbo(3sp at). The problem is that
when the a/c is on, the car barely accelerates. I read somewhere that the
ecu is supposed to compensate for the increased stress that the compressor
puts on the engine; it seems as if mine is not doing that at all. It feels
like the ignition timing is hopelessly retarded; the car is very slow at
first but then the car goes fine once the turbo boost reaches 1.0 and above.
Accelerating from start literally takes forever; this makes the car
dangerous to drive in the city. I really would like to take care of this
problem once and for all. The AC Delco control unit inside my car is in
questionable condition; could that be a problem? Where do I start? Please
help. TIA

86 5kcst