hi, i am new to the forums, i just bought 1990 300zx with 72k on it (km not m). the clutch was slipping when i got it and a few days ago just completely cut out. when i put it into gear and try to drive it just revs. Would that be my clutch that needs to be replaced? or one of the cylinders?

also. my car sometimes shut off when driving (more common after driving harder)

(car has electronic boost controller up to 16psi but only ran at about 6-12 , 2 1/2 inch dual exhaust)

Please help, whats wrong with my z so i can get it back on the road but have a little knowledge so the repair shops dont try to walk all over me!