1985 nissan exa turbo

lots of causes, can name 50
but low fuel pressure tops my list. fuel filter packed.
get the car serviced.
(or clogged map of maf sensors)
wow it ran for 23 years (magic that)

check fuel pump.if there is a small , even hairline crack in the diaphram it will do as yours does. good luck.

check the firing order as it indicates 2 wires crossed

if engine idle good stall on acceleration either fuel filter clogged or fuel pump weak has low fuel pressure.

My vg30 dnt rev more than. 2200

overhaul of carb needed, check the vaccum advancer for wear n tear, rapace f necessary fo

Idle air control valves short out all the time on these models. You can ohm the motor to check it, but the down side to a shorted iac valve is that it shorts out the ecm if not repaired quickly. when the valve shorts, 12 volts is supplied directly to the ecm and burns the circuit board. The other option is the air flow meter, this is also a very common problem but typically a p0171/p0174 would be stored in self diag.

you need to have the fuel pressure checked

I would start with the TPS, and if it doesn't solve it then the AFM would be the problem.

hows the engine mounts? did anything happen leading up to this problem?