This song is from 1986. That choir-like stab, I'm having a real hard time getting that sound. I'm hearing vocal-like sound, an e-piano and maybe a rhodesy synth? I thought this would be a simple find on the Korg Wavestation which has all sorts of tubular, airy sounds but I really can't find anything similar.
There are other sounds in this song that are so close to synth presets, that I can't imagine this stab is something meticulously crafted... alas.