My car has been stalling when I go on long trips after about 150 miles it stalls on 2002 Mercedes-Benz C240

i get it to side of road and crank it up and continue. This time it stopped 5 times before I got back home. Nothing shows up on the computer .I have had it at the garage twice they said unless it shows on computer they cant help.THis has done this about 4 times only on long trips.I also have a clicking noise when I go fast it speeds up also and if I slow down it slows almost sounds like something in a bicycle spoke.

Asked by for the 2002 Mercedes-Benz C240