I have a 2001 C240 manual transmission that has twice had a situation where when I start it it runs rough like it's not getting any gas. The first time I stopped immediately to check the gas cap, because I know from previous experience if it's not on tight then it could cause the check engine light to come on. When I restarted the car it was fine. The second time I just thought maybe it was cold, and I was late for an interview (!) so I drove it anyway, on the freeway where it would NOT accelerate no matter that I was flooring it. I had to put on the hazard lights so as not to get rear-ended. When I stopped to drop my kid off at daycare and restarted the car, it was like nothing had ever happened, it was fine. It is at the dealer now (I didn't drive it after this episode) and they can't duplicate the problem and the only code they got from the engine was a misfire. I have an extended warranty but that will only pay if they find out what's wrong, so as it sounds right now I'm on the hook for $200.00 diagnostic time, AND I don't have a car I trust to drive. Does anyone have any ideas what's wrong?