Join Date: Nov 1999
Location: Palm Beach Gardens, FL
Sorry if I missed this in any of the posts, but the symptoms described indicate motor mounts are needed. They can be easily inspected with the car parked & on the ground. Open the hood, push down on the engine, hard. If you can move it around, even a little bit, the rubber in the mounts has degraded. If you can visually inspect the mounts, you may find that 1 or more have collapsed completely. When the rubber is gone, it's metal to metal contact, top & bottom of mount meet; safety feature so the engine doesn't fall out of the bay.
1988 GT, 57k mi, Orig Owner
ProCharger P600B, FRPP Headers, Flowmaster F2, 3G Alt, Mk8 Fan/DCC, 3.55's, Prog Springs, ST Brace, G/Trac Bar, Subfrms, UCA, LCA, FCA, Tokico 5-ways, C/C Plates, CSA 16x8, Bridgestone RE760 Sport 225/50R16, Megasquirt DIYPNPF60, LC2 wideband, C&L76mm MAF w/30's