So I had my hood open the other day just making sure all was ok. I put my finger on the injectors and can feel a noticeable "tick" when they fire off. All of them do it except for the one in the far back on the passenger side. Unplugging the injector does not seem to make a difference in the way the engine runs though unplugging the one right next to it(that does noticeably tick) DOES make it idle a bit wonky. I also took that same injector connector and swapped it with the one right next to it and no change to that far back injector but the one next to it did work. Probably answering my own question with all my symptoms but Im guessing that one is probably bad right?

I have a set that look exactly like the stock LT1 injectors, that came from a 90s big block chevy van. I believe they are interchangeable so I am going to try swapping one of those in.

 

pick up a noid light and make sure the computer is telling it to fire. could be bad connection. you will want an injector that is the same flow as the others in the engine. look for numbers on the injectors, just because they look the same does not mean they flow the same.

 

Good luck, all injectors are not the same - lbs per hour delivery.
Injectors are driven by the PCM, two groups.
O2 sensor info tells PCM fuel amount, PCM shorten/lengthens injector open pulse.
If one injector is 19 lbs/hr and the rest are 24 lbs.hr, one cylinder will be lean, sorta.
Probably won't know the difference when running.
Also, check injector coil resistance and compare with good one.
A mismatch will affect performance and reliability of PCM.
General rule of thumb, if one goes though the motion of replacing one injector, do the rest - matched set.

Just like doing brakes, you do an axle set, not just one wheel.
But, you won't know until you change out the injector to see if problem goes away.

 

one way to find out if it is an injector is to have them all cleaned and flow tested. not too expensive, way less than new ones.