Hello I recently have been trying to repair my ac system i was told the compressor worked. I replaced the expansion valve the receiver dryer flushed the system out dried the system out and replaced all the o rings. I refilled the system with oil and freon and it seems to be holding the charge and now when i start the car and turn on the ac it starts which it didnt before cause of the leak it had but the compressor spins then stops and stutters for a second then spins for awhile again and it or the belt squeals when it stutters. Does this mean that the compressor needs more oil? and if so should i completely remove the compressor get good oil for it put it in the compressor put it back together and put more freon in it or is that too much effort if im not buying a new one? can i just add a can of oil to the system like i did when i put more freon in it? any advice would be greatly appreciated. Also i cant seem to find out exactly how much psi the system should have on the "low side? part where you add more freon" and if i have to test it when its on or off. Thanks for all the help thus far!!!!