1990 Suzuki Vitara stalls while driving

Just recently bought vitara, has had mechanical work and has a full mechanical history, drove around for about 2 weeks then suddenly under power it would loose rpm and would stall. Thought it was the auto choke kicking in, checked operates for a few seconds then opens, checked spark has good spark, ran car not running and check garby for fuel flow, fuel flow is ok, drove around without air filter and cover for a short time, same problem occurred, found a loose hose and reconnected it, seems to idle better but same problem, my question is, would it be a fuel filter? Fuel pump or vacuum house.