Added A/C and now idle is too low/rough

[chevy72blu]

I had an A/C shop install a factory style A/C unit in my factory air 72 C10 with a 98 F body LS1. I know nothing about how to install A/C, and I dont care to learn at this point in my life. I drove the truck without air for years, and it idled smooth and ran great.

With the additional load from the compressor, it now idles around 550 RPM in gear. Obviously, the motor is unhappy about this. Switching the AC on doesnt stall the truck, but it is close.

My swap harness is from PSI.

Is this as simple as bumping the idle and in gear RPM a few hundred in HP Tuners?

It seems the factory way is to use the PCM to do this, with a signal wire indicating that the A/C is now on. This seems more complicated, and it's not how it is currently setup.

My truck is a basic driver and if "it works, it works" as far as I'm concerned.