I’m not sure if there’s a way to test them, but generally it will throw a code 41 or 91. Atleast that’s what mine did. Did you follow the surging idle checklist in order? Since this thread is getting pretty lengthy it may be beneficial to make a summary of what you’ve done so far.
Yeah, there are no codes at this point. All code 11 (no faults)
When I bought the car they had put in new fuel injectors (no identification markings on them but have organge top and someone up above said they were the right ones). They also pulled the gas tank and empty all of the bad gas out. I bought the car and it was running pretty similar to how it's running now. This was after it sat for an estimated 13 years.
After I bought the car I drug it home. Changed the oil and put in marvel mystery oil. I also changed the brake fluid through the system and bled. Still had brake issues.
At this point I took it to a mechanic. They replaced the proportional valve, said the fuel injectors are probably fine (but didn't run any tests), replaced the water pump, bypassed the heater core (which is leaking and needs to be replaced), and swapped out some coolant hoses to stop some leaks. They got the brakes somewhat working but I still need to replace the brake booster (I believe as it has a soft brake pedal).
I bought the car home and attempted to go through the idle surging checklist. I confirmed .99 on the TPS (adjusted the throttle a bit to get it there) and running about 600 rpms. The IAC seems ok as I start the car without it and it will run like crap. I plug the IAC in and it gets significantly better. So, it's doing something. I turned the timing up a hair to 12 degrees. I also swapped the plugs out with OEM plugs.
I've attempted to go through and verify all of the vacuum lines are connected and no ports are open. I don't know that I've done this 100% because I haven't pulled the hose diagram out and traced each one.
I took a temperature gun to the exhaust manifolds and noticed the passenger bank cylinders were about 50-100 degrees cooler than the drivers side. Someone suggested I swap the injectors so I did that. In the process of swapping the injectors I confirmed the vacuum hoses under the intake and the pcv were connected. I haven't had a chance to get a temperature gun to see if the cooler cyclinders are still on the same bank or if it moved with the injectors.
The car runs better but far from good. There is a small surging at idle and when I drive the car it bogs down when I push the gas pedal until I hit about 1500 RPMS. It still feels a little off but it gets pretty good zip after that. Black smoke comes out of the exhaust and the smell of gas is everywhere. Very rich.
Here is a video of it running currently. For some reason the idle has dropped down to about 500 - 550 and I think I need to turn it up a hair.
Current Running Video