The past couple of days Ive been noticing that when its already in 3rd or 4th and Im on the lower end of the RPM range and I give it some gas, the car shakes side to side. It also does it when Im giving it gas to well over 3k RPM as well. What could this possibly be?

 

bad motor mount is where you start
front and pass side common failure..front gets 60-70kmiles if lucky

front goes,,then side from extra load,,,
front is $150 part, filled with special oil.. and vacuum boosted!!
failure causes vac leak,engine movement, drive shaft movement,,,

after those look for codes, any about misfire are coil failure

 

do you run a fuel cleaner, good gas etc?
carbon buildup is bad and must be cleaned out

egr system clogs- remove intake manifold to clean it out every 75kmiles