I have a Focus 2000, automatic. 67K miles. It starts fine, but stalls after running about 5 minutes. I can keep it going by pressing accelerator, but it dies as soon as I let up or put it into gear. This problem happened suddenly, with no warning, such as rough idle. Here's the unusual bit: just before it happened, I had changed out the ignition cylinder lock, which had jammed. Bought a new one and set the tumblers to my original key. In the process, I disconnected the battery's negative cable to prevent accidental air bag release and then re-attached. Do you think there's any electrical reason for this stalling? (I did re-set the fuel pump switch.) Thanks, anyone!