I have a 1998 JGC with Quadra Trak. When cold, I can be driving down the road, pushing down on the gas pedal when suddenly I'm coasting, the engine will rev when I push down on the gas but the transmission won't engage. I have to continue pushing on the gas pedal and letting off until finally it will engage and away I go. Anyone have any ideas of what this could be. It did it last winter and again this winter but never had a problem in the warm weather.