I am having a problem with both my 5 liter car and 99 GT. I inherited the problem upon purchase of the 91. After changing to a supposed KING COBRA( says Valeo) clutch purchased from the UPR booth at last years WFC and a Steeda adjustable quadrant and cable the car squeals at idle and under slight acceleration. If I barely put force and I mean barely on the clutch pedal the squeal will stop at idle. Also the clutch pedal vibrates and rumbles real bad. We have adjusted the cable at the firewall and at the fork and cannot get the shake and squeal out of the clutch pedal. Any insight on what this is?