At first it missed and was idling rough. Now it is like doing a jerk sort of a hiccup. All this started when I had to replace the power steering pump.It normally does it in drive and reverse. When I turn the air on it lowers the RPM's and misses real bad. Any help would be appreciated.

 

The IAC(idle air control) on the vavle body can accumulate deposits and effect the way it works. It could also be bad and not working.
When the electrical connector is disconnected there should be a change in the idle. Turning on the A/C should change the idle also.
This could be your source of the problem. A bad IAC can set a DTC (trouble code) if problem occurs. If you have none a good cleaning of the throttle body may work.
Changing power steering pump, There are wires that can be effected by removing the Serp. belt.