When i turn the car on the car makes a lound clunking sound kinda like what you hear if you put a marble in a plastic jug and shook it. It also does it when im shifting some times. It shakes like your about to stall out(but it doesnt) sometimes when you turn it on or you start off from a stop. Is this my front end mount or my engine mount or something else?

If i hit a bump while driving it makes that marble in plastic jar sound. Is it one of those or is it something else?



Also how hard are they to replace?



Thank you for the help.