How do i fix this problem? I know you're supposed to adjust some screw, but where is it? Also, what is the correct procedure for doing this?

 

There are a few screws on the back of the intake collector, or if you are looking at the engine from the front its at the back left of the engine. Once you find that its the big screw that you want to turn, but there is a procedure i would get a haynes manual it tells you the whole procedure. I have the hayne manual and still need to do that same thing but just haven't gotten to it. Plus i wouldn't worry about it unless your engine is trying to die.

 

It shakes alot at stops so ignoring it isn't an option