I have a 2002 Chrysler Voyager EC that randomly jerks or bucks while I have my foot lightly on the gas pedal. If I come to a stop or slow down, when I put my foot on the gas pedal to speed up, it doesn't want to go. It hesitates as if no power, then catches and speeds up. Sometimes it stalls. On occasion it has a very rough start and after idling for a few seconds, shuts off. Takes about 10 tries before it runs. Then it may run great for a few days before acting up again. Only does this when gas pedal is lightly pressed. Could this be the throttle sensor? Just had the crankshaft sensor replaced twice in one year. Thanks.