CompuServe Messages

I've created a car accident scene where the car goes for a block and a half and then rotates clockwise for 180 degrees and lands on its top with a slight twist to the left in 3DS4 Keyframer. When I went back to frame 0 the car had rotated slightly so that the front wheel were slightly below pavement and the rear wheely were slightly above pavement. When I did a slight -2.00 degree "Y" rotation (hit tab key two times for correct rotation) the car does all kinds of flips and weird rotations as it goes down the street now. (I only rotated in "Y" axis and I have tried everthing many times includeing Bias, tention, etc adjustments). When I started my key rotate settings were X= .999696, Y= -0.01912, Z= .015578, Angel 269.793. After rotation X= –0.99999, Y= .00173, Z= .001871, Angle 90.18602. If I rerotated back 2 degrees X= -0.99969, Y=0.019123, Z= -0.0157, angle 90.20688. Whats going on here? and how do I fix that first frame? Thanks Marv………..