Greg,
I tend to defer to Jeff.
When my injectors went out to lunch it was just that quick. I don't actually know how many were bad as I never actually checked the injectors with an VOM. I used a scan tool to take the O2, block and integrator numbers. All that stuff was out of range & pointed to the injectors....that was after I checked the obvious: plugs, fuel filter, vacuum leaks, wires, fuel pump chart A7 diagnostic test...oh and every electrical connection I could reach also
The car was working fine...I shut it off & restarted and I had this slight miss, the more load the more miss...eventually it got so bad that I could smell a lean condition at the tail pipes and the plugs on one entire bank were not getting much fuel to ignite. Try a scan and post up the numbers and the guys that know that stuff will analyze the results and tell you what's up. They did that for me and taught me stuff that I had no clue about!
Tom