hi, thanks for all your help!
1) I just had all four tires balanced last week when i brought my car back in to the tire shop and told them the problem; and they were aligned when i bought the tires last july, so I agree that the tires are NOT the problem
2) I also just got a tune-up last week so the spark plugs are brand new now, however i still feel the vibration
3) Yes, it occurs when it passes 1800rpms while I'm accelerating, but i have an automatic so i guess it's only on first gear? Also, it doesnt happen EVERY time it passes 1800, i don't know what makes it vibrate at certain times, but it IS always at 1800..
As far as the vibration, I would say that i can feel it through the whole car, and for any sounds, all i hear is the vibration sound. If I could describe how it feels, it's like the kind of vibration you feel when you drive on those small reflective bumps on the road.. or like running over a wire laid across the road. It only lasts like 2 secs..
My boyfriend also suggests that maybe there is a problem with the differential... Would that cause something like this?
Again, thanks for all your help, I'm trying my best to describe this whole situation to you guys.. I really appreciate it!
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