1994 Protege Rough Idle

I have a 1994 Protege DX (SOHC)5 Speed that idles very rough at a stop
as well as bucking as gears are changed. This happens most noticeably
when AC is on. Turn AC off at a light, and rough idle stops
immediately. The car when first started in the morning and AC on, will
not buck or rough idle until engine warms up. I can also duplicate the
rough idle with AC off and steering wheel turned all the way R or L. So
it appears heavy loads are doing something. The voltage at the battery
remains steady under load. There are no codes showing.
Here is what I have done so far:
New plugs
Wires are fairly new and look good
New distributor cap and rotor.
Cleaned throttle body
New air filter
New fuel filter
Checked for restrictions and or cracks in air hose.
Checked vacuum lines for cracks ect.
Any help would be much appreciated. Thank you