When did it start to happen ? First start up of the day ? driving down the road ?
Just fill the tank and within so many miles it started to act up??
Since its Sat and nobody will be open tomorrow , try to do a few things that have been suggested here if you feel ok doing them.
Do the basics pull the doghouse off and look around abit , no obvious wires loose ? while running no arcing anywhere ? (plug wires) etc..
Could have picked up some bad fuel ? Coils could have crapped out on ya.
Whatever the case good luck to you and hope its something simple !