JarydW123, I have to agree with 79Mercy. From reading this, it sounds like when a load is imposed upon the engine (A/C on) the motor seems to become unbalanced (for lack of a better word at the moment). Yes, this could be injector related. Another possibility, although I haven't tested this on my car yet for the A/C's was disconnected when I bought the car, could it be a bad (piston) in the A/C pump.