This car has been seen by the dealer repeatedly (once for almost two weeks, while the mechanic drove it to and from work) to see if this problem would reproduce for them. So far, we have replaced TPS, fuel filter and numerous other items and car has been towed at least twice to the dealership. It has most noticeably begun to just go dead while driving, resulting in another week in the shop and, at our suggestion, the replacement of the fuel filter. The day after I got the car back, it shuddered and died yet again.