So i have a vibration when i accelerate but only between 1500 and 2000 rpm,s that is when it is strong. Then i can fell a little vibration when i am driving. But if i let off the gas or if i keep it in neutral or park it is fine. What could it be?

 

Since nobody else has replied - I'll guess at some possible causes.

If the vibration is purely associated with the Engine's rpm:
-worn engine mount(s)?
-bad spark plug wires or distributor cap?

If the vibration is purely associated with the car in motion:
-low air pressure in tire(s)?
-Wheel bearing going bad?
-Bad tie-rod end?
-Bad ball-joint?
-thrown belt in tire?
-lost balancing weight from rim(s)?
-loose strut(s)?

Anyways...., those are just guesses, but better than nothing I suppose.

 

If you want to check if it's an engine mount(if it's that little rubber thing), have a friend help you with it. One of you look at the engine while the other does a couple quick revs. If a mount is gone, the engine will "jump around" pretty strongly.
(thats the only one I may be able to help with, I got an idle vibration )

 

that is true, but I dont see why you need a friend. The throttle cable is right there on top of the engine at the throttle body, you can just move that yourself while looking at the engine

 

actually i just replaced all motor mounts as well as the tranny mount and it is still doing it

 

something wrong with the exhaust?
i had a toyota with a busted resonator that would _always_ rattle at 4000rpm

 

i dont know about that, well it only vibrates when i am giving it gas and it vibrates more when i first take off from a dead stop!!