1988 FC Non-turbo may be running rich
 

I just bought an 88 FC for 600 bucks. It's surprisingly complete for that price. Only problem is the mold, a couple cracks, and it won't stay running. I rushed into the deal without doing a compression test. ~_~

However! I just checked it today and it's at 120 psi!

So, at first it wouldn't start so I changed the fuel pump.

Then it wouldn't stay on so I changed injectors.

Then it seemed to be running extremely rich with black smoke, shaking, and no power. So I changed the fuel pressure regulator, spark plugs, coolant temp sensor, and O2 sensor. It seems to stay on longer but still running terrible.

Whenever I unplug the mass airflow sensor, it runs perfectly but suddenly cuts off after 5 seconds or so. So I tried a new mass airflow sensor but it made no difference.¯\_(ツ)_/¯

I'm thinking it's the ECU because there were a couple rusty looking points on the board. I soldered them but it made no difference.
I adjusted the TPS and it ran nicely for half a minute but now it won't start again
When it runs nice it won't get past about 2700 rpm. That number gets lower as the engine gets warmer.
It seems to want to get the warmup rpm but it can't make it.

I should mention that the car has electrical issues. Sometimes the door lights come on and the key-in-ignition beep works, but sometimes it doesn't. Also, the washer fluid light seems to be functioning as the battery warning light. lol

In short, I have no idea what's wrong. Please send help quick. I really like this car. (´⌒`｡)