First off i have a 1.6 96 200sx. I have noticed recently that my A/C is not as cold as it used to be. I decided to add more refrigerant to the system today. Picked up a kit and checked the pressure, was about 15 psi lower than needed so i added more exactly as the instructions indicated. I went for a test drive and noticed a new problem. It seems the A/C clutch (this is was i believe is the culprit) engages for a few seconds and then disengages for a few more seconds and back and forth. I feel the car slow when it engages and speed up when it disengages. This was not happening before i added the refrigerant. Anyone ever have this happen? Is there somewhere i went wrong?