Hi I'm new hear and looking for some info/help I've got a 03 focus and when I was driving the other nite my engine management light flashed a few times then went off and the car started running funny. I got it trailered to a local garage there is now error code showing. And it idles but when you rev it it's missing. There is no compression on number 4 and there is 2 bent valves and spark plug is black. Could any one tel me what could of corsed the problem or how much it would cost to fix. Any help/info would be much appreciated Thanks Martin.