I have a 1985 tpi iroc. I’ve gone through the vacuum lines, new maf, fuel pump, plugs wires, cap and rotor, ignition module, coolant temp sensor.
I bought the car after it had sat for about 10 years it has good compression but I’ve had to really turn the distributor to get it to idle on its own. It’s rough and when I give it some gas the motor kinda shakes and is hesitant. Originally the dizzy ignition coil was pointing towards number 1 cylinder. I’ve had to rotate it where it’s facing the driver so it will stay running. I did unplug the tan wire when I set the timing. I’m out of ideas on what could be the issue and why the timing is so off

 

Fuel pressure is ? Did you change the varnished injectors ?

 

Fuel pressure is good. I didn’t replace them. But I did check them all and cleaned them up and installed new o rings. I think I’ve figured out my problem. I’m getting 4 codes. All of which my book says vacuum or open circuit. I’ve went through the vac lines. But I wouldn’t be Suprised to find bad wires in here.