This has interestingly been troubling me, I was reading some information on the forum and decided to post and ask for help. My sohc focus has been idling running rough and now stalling.. I changed out the ecv hose and ecv valve which I got from a Ford dealer. I changed the plugs and wires and it seems to be idling really low and dying whenever I let off the gas. I can rev her and give her gas and she stays running. I have installed the previous and some new o2 censors. Any idea guys?