looking at buying a 92 4runner with a misfire

I'm looking at buying a 1992 4runner it has about 240000km there is a misfire and the guy said he changed the plugs rotor and cap, i will have to drive it for awhile to get it home, is this somthing i should be worred about or can it wait till i get back to my house?what would the worst case senerio be?

thank you for your time and help