having a strange problem i need help with. i have an r33 gtst series 2 and when the air conditioning is on the belt will screech for a split second and it feels like the crankshaft locks up for that split second as well, or perhaps the car jolts, not sure only guessing. happens once a minute or so. ive had the A/C compressor reconditioned and a new receiver/dryer and problem still remains. does anybody have any sort of help?? thank you