W140 97 S500 "needs engine"?
 

thinking of picking up a 97 S500 that needs an engine. 122k the car starts up and seems like only 4 cylinders are firing. the body is in excellent shape, and so is the interior. are there any major issues with these cars that i should consider? dont want to get in over my head on this. like buying the car and then putting too much $$ into it. thanks for the help!