Originally Posted by bificus
Either that or AFM. ECU kicks in full fuel after 2800 rpm (iirc) correct me if I am off on that. So off idle to then on part throttle AFM is controlling fuel.
I'd suggest he check the plugs for the AFM and throttle position sensor for corrosion and break out the deox-it if there is.
EDIT (addition): I'm not sure if this is how it works, but what if he unplugged the throttle position sensor. That would isolate it as a test but I'm not sure if/how the car will run without it.
1978 280z - stock L28 engine - Dallas, TX