Reliability of a 1990 ford f150?

I wrecked my old car and am buying a new car at the end of December when my house is done being built and my credit opens up. I needed a car to get to work for 2 months so i bought a 1990 f150 for $1000 to get me threw 2 months, so far it has driven fine, if i sit still for too long it starts to stutter and sometimes stalls in reverse if i leave it sitting, i was wondering what the chances are of it making it threw 2 months

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