Marcus & Perkins (1997)

Two guys are given a job: to kill a man, and they decide to bring his corpse to their boss as proof that the job has been done. Everything seems to be going according to plan until, halfway through the journey, their car runs out of gas on a deserted road. Stranded, with tensions rising between them and problems piling up, they must find a way to keep moving before the consequences of their crime catch up with them.