i have a 1999c230 mercedes = my problem is -when i first start it up it misses and does not take the gas = then it will clear out and run good for all day = but this morning it missed all the time i was driving it - check engine light on = oil in the throttle body =just changed the pcv valve =cleaned oil from mas and throttle body = oil came back= coumperter says bad valcume leak =#1 cy l missing =can anyone help.. thanks