Sorry accelleration with AC on
 

I have a 83 300 SD with 319,000 miles on it. The cars acceleration with the AC on is terrible at low speeds. Any suggestions.

I built an AC from scratch and put it on my 71 Karman Ghia,,, I used a normally closed switch mounted on the left of the shift knob to turn off the ac off with my right thumb when I was shifting . It made a big difference on my escape speed...