I have a vibration at speed when I have a slight dip in the road (coming out of the dip) , at curves for just a moment , but not under moderate or hard acceleration. I thought it might be my tires because I recently put on some new Goodrich tires but it really feels like the engine to me. It's a quick shudder and I noticed it was more prevelent yesterday when we had the car loaded with people, and it even did it on a straight smooth road. I can't really tell if it feels like maybe just one coil pack (the speed of the vibration) or something to do with all the cylinders like ..... you fill in the blank. Help, I don't have any diagnostic programs or computer yet but I will be getting one early next year for sure. Any suggestions as how to narrow down the search or pinpointthe causenow? thanks RV

 

I would inspect all the engine mounts and lower control arm bushings.