kia sedona vibrating / vibration

[rmcook]

KIA SEDONA, 54 Model (2004), 2.9 LE, 48,000 miles.
Hello. I have a Kia Sedona 2004 model. This morning, I was driving along when suddenly, its started vibrating quite violently. I immediatly turned around and went home. I initially thought it was the exhaust because it was making a really loud noice. When I got home, I realised it was coming from the engine. When outside the car, the noise it not as bad than when inside. When driving, and I put my foot on the accelerator, the noise and vibration calms down. Does anyone know what is wrong with my car?!

[TWR]

Hi, have you hit the kirb with your wheels? if so you may have damaged one, are the tyres inflated? if you can, check under the car to eliminate the exhaust, can you drive out of the Vibration by increasing your speed? If so either the tyre has damage or the balance weights has dropped off your wheel. has this only just started? there is also a possibility that you have a drive shaft problem.

[AlBags]

You will not get a serious vibration under those conditions with wheel-weights coming off.
If coming from engine/transmission, check (or get checked) the transmission oil level. It's possible to get bad noises like vibration from primary transfer gear bearings.