Car starts and then will not start again

My 2002 Ford Focus zx5 with the 2.0 Dohc engine was running fine down the highway when it started to sputter and then died. It wouldn't start back up for some time and became flooded. It eventually started and would not stay running unless the pedal was pressed all the way to the floor and it was running very rough at that time. It eventually died again and would not start. I took it to a ford dealership and they were at first thinking I had bad gas but ruled that out, they then decided that it was the timing belt. They said there were no codes present and that I was getting fuel and spark and they said the fuel pressure was good. I have since removed the timing covers and found the belt to be in tact with no missing teeth or anything. I am going to replace the timing belt as it is due according to the maintenance schedule but I don't think that this is the problem. Do you have any Ideas on what is causing this problem.