When I was accelerating in my RS today (305 TBI) there was a hesitation and sputtering sound followed by a "pop" (possibly backfire?)

It seemed to be running really rich and stumbling at idle, with RPMs hovering around 500.

I took off the intake and I looked at the injectors. Here's a video:
Is this too much gas for idle? It seems like a lot.

Do I need an injector/IAC rebuild?

 

When I floor it, black smoke comes out of the exhaust but only for a second

 

Connect a scan tool.

What are the values for O2 sensor voltage, O2 crosscounts, coolant temp sensor, short- and long-term fuel trim, and MAP sensor?

A cylinder-balance test would be wonderful, too.

 

Okay I bought a code reader so I'll let you know when I get it. But just by looking at it, does there seem to be too much fuel being injected? It's dripping down the sides of the throttle body bore

 

Usually popping and such is caused by running too lean, timing is off, or your valves aren't seating.

 

A "code reader" does not access the data stream. They're almost worthless.

Return it and get a scan tool.

 

Sorry, I was being colloquial. I got the ALDL -> Serial Port cable. The one that you can use with TunerPro and WinALDL