any common problems they have ?

111 bhp @ 5500rpm. 0-60 in 11.5 seconds, top speed 123 mph.
the E36 shape BMW 3 series is a great robust car, if well looked after. J reg being 1991-2, any old car checks will apply. If the car is rusty, walk, it may of been in a crash and poorly repaired.
Always look for service history as when a German car breaks (rare), it costs.
These cars are often driven like race cars, gently rest your foot on the brake pedal when driving, if it rumbles, the discs are warped.