I dont know if anyone has asked this but im new and i have a major problem. all my campression is good except no 4 which is 70 (before this all happened.) I got to work and it was idling really bad. after work i left and it started overheating. my oil pressure dropped way low so i stopped at the nearest gas station to hae a look at the motor. then it died. i finally got it started and headed home. about ten miles later i hit the clutch to turn on to my road and it died. i made the turn and put it back into gear and it started back up with loud loud clicking and knocking.... i pulled into my driveway and it died haven't done anything with it since. 2 doay ago and i havent looked at it because of lots of school and work. whats wrong where should i begin help please.