Don't know if this will be helpful or even understandable but here goes....... I also had a similar problem with my toyo. It would vibrate in jam when stationary especially on hot days or when the engine is hot .................... I dont recall it happening when the engine was cold. Talked to a mechanic who advised the following....
open the place wher the air from the air filter gets into the engine block. On the inside of the engine block when you look in through the opening,there will be a valve and a small hole just below and infront of the valve that seems to by pass the valve from below and tokezea on the other side of the valve. You may discover that that hole plus the valve are covered in soot. Try cleaning out this soot with a solvent and cloth( I think one brand name is widex.... available in the supermarket) Clean that whole inlet as best as you can and see if that helps.Try squirting some of the solvent into the air inlet with the engine running to clean up other valves inside that you cannot reach. It worked for me and a freind of mine also who owns a starlet. Be ready for a bit of a hard start when you are through.
Rather than spending all your time reading about the future and trying to figure the nuances of what is it might hold,may be you should spend at least as much time getting to know Him better (David Jeremiah)
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.