I have a 2002 Beetle Turbo S that starts, but dies immediately. I drove it down the driveway for a few seconds, backed it up, turned it off, went into my house, back out to start it again, and it dies immediately. We changed the battery, that wasn't it. Don't have an owner's manual, wondering if it's the key? Only have one key, so can't check it with another one. Anyone have any thing else we could check out?