Have a 1990 300ZX. Engine cuts out when at steady speed -- just like turning the key off. Any speed, any temperature. Need to back off throttle and then reapply throttle to keep running. Intermittent. Does not cut out under acceleration, ever. Recent fuel and air filters. Reseated two big connectors front of engine right side (from drivers seat). Biggest connector has green male and female contacts. Burnished male connectors -- cannot get to female connectors.

hi mate. being an earlier model it could be down to a faulty Series 1 PTU. many people have experienced similar problems, with the car just cutting out. sometimes they need to wait for several minutes for the unit to cool before the car will fire up again. if the PTU is the problem then it can be replaced by another Series 1 (about £40 from on here) or upgraded to a Series 2 (about £120). good luck

Thanks mate.

 

Regards,

Al Keegan

Austin, TX