Why your car shakes when you accelerate between 0 to 55?

try changing your sparkplugs. there could be a firing issue with the cylinder heads. also might want to look into a timing belt. might need to be reflashed for proper ignition firing. look into small fuel system maintenance like changing the fuel filter or pump. could be water or impurities in yr gas tank that are not burning off during the fuel burn and making the engine "stutter"

if its not doing it after 55MPH i doubt that its a balancing issue, but take a look at the struts/springs make sure nothing is loose.