Horisontal Particle emitors

For the walk animation for a vehicle i made, it has a couple of particle emitors coming from the engines, yet im not sure how to make it horisontal durning the walk animation.
Ive tried animating to be horisontal, although this results in the particles moving horisontal and then back to original postition looping, and in the note keys i have even applied "non looping" to the notes, although the particles still move horisontal then revert back to original positiom. Does anyone know how i can make the particles move to the horisontal position during walk animation?

It is weird i tryed some stuff million times i dont know how to do that..

This is in 3ds max, right? if so, create rotation keyframes for them facing horizontally at both the beginning and end of each animation. You can just rotate 1 degree then -1 degrees to make it so there is a keyframe but it doesn't move.

ah thx oinkerwinkle ill save that in a txt becouse of my 3dsmax4.2 is loading to the internet the whole time and crashes my computer.....

ha it worked thnx!