i have a 99 si that shakes in 2nd 3rd and 4th second isn't so bad 3rd gets worse and violently shakes the car and 4th calms back down/ if the car is not accelerated in these gears it drives fine with no shaking. the car seems to be fine i took it to 90 in 5th and it drove perfect. could this be a tranny problem? tie rod end? cv joints? maybe even a sway bar that could be broken? if you have ever had this problem and had it elimanated you please email me
northwesthesh@hotmail.com
thanks!
daniel

 

welcome to the forum, have you checked your engine mounts, see if they are worn or bottoming out