OK, ansered my own question. Threw a code 24, VSS. Speed sensor reads off speedometer signal, according to fsm, sec 8 33. Makes sense that the cruise control starting acting up about the same time the speedo cable really started to crap out. It's been shaking and pulseating for a couple years, mostly at low speeds, the faster I went the smoother it got , so I didn't care. Last trip to the mountains it started shaking pretty bad at highway speeds also, coincedently the cruise started acting up at the same time. It wouldn't hold speed, it would engage, then accellerate, then pulse (speed wise) then disengage. I didn't want to get into changing the cable ( have a new one ready to go) It looks like a real pita, so I put it off. I guess now I have too. Anyone change out a speedo cable in a 95 Trackick without removeing the heater core?