well i have 2 focus and will tell you just what your problem was and is "the 2.0 sohc"this motor is a boat anchor do not replace it.they are horrendous for dropping valveseats.and if you look at that intake valve it looks like its bent slightly ,they are super brittle.what happens is it drops and gets busted into small pieces then gets pumped back thru the intake and into other cylinders.usually all cylinders look like that.your best bet it to find a wrecked 2.0 dohc z-tec.these motors are pretty much bullit proof.BUT to do the swap you need to take the whole under hood wiring harness and computer,this harness also extends under the pass side carpet and under the back seat,thru a grommet and to the gas tank.you also need the key from the donor car as there is a chip in the key that needs to be swapped to your key.1 of mine had a blown 2.0 sohc when i got it.i found a wagon with a z-tec that was lightly rearended.took and dropped the whole front subframe,:engine,trans,hubs,etc and swapped the whole thing.took me about 3 days of off and on to swap.plus i got a whole car of odds and end parts to save