Need suggestions

[KB93z28]

Well someone I know is selling a 1990 nissan z32 (300zx) Twin turbo 5 spd. The body has 180k on it but the motor has been swapped for a JDM motor with app 40-50k on it. The car Does not run properly at the moment, it starts up and then dies, it will stay running if you keep your foot on the gas. The car itself is in great shape, really clean underneath and it was making about 14 pounds of boost which should put it in the 330 wheel range.


heres the ad: http://boston.craigslist.org/gbs/cto/3122673972.html

I really want this car (dont worry keeping the camaro too) but i dont want this problem to turn out to be something huge. Idk if anyone on here knows anything about these cars but any advice would be great. He has checked his vacuum lines, IC piping, replaced upper plenum gasket and thats it. still doesnt run right.