I've got a serious problem

[vilant]

So, I decided to drive my Z to Ocean City NJ for a corvette show @80+ mi.. On the way down I started to notice the engine stumbling in 6th going @80mph if I hit the gas pedal. Didn't think much of it, as the fuel injectors are the original '90's and was planning to change them this winter. But when I stopped to pay tolls I almost couldn't accelerate it was stumbling so badly. I made it down, but now I'm really nervous it won't make it back. I also noticed the engine knocking now when the RPM's fall below 1000. My questions are these
1- It's stumbling badly, but as long as I accelerate slowly it drives (noisly). Do you think it will make it 80mi.?
2- The knocking I'm hearing below 1000 rpm's, is it directly related to the bad fuel injectors?
3-When I had it inspected in Aug. there was a ton of codes, like cam sensor, MAP sensor, some hi and lo vacuum codes. Are these related to the bad injectors as well?
4- Once I get it home, I can't drive it until the injector change. Since I'll have the engine torn apart should I order other parts? Like MAP sensor, cam sensor. Not sure what I'll have access to when I take apart the top part of the engine.
Any help is greatly appreciated, as I am complete nervous wreck right now. It will be very costly to have it towed home. And now I have to pump in another few thousand just to get it running right.