In case anyone comes across this thread, another thing to consider is replacing the rubber seals around the injectors and the o-rings around the injector sleeves. This made all the difference in the world to my car's idle and performance. I know smp stated early in the thread that he had done the carb spray test around the engine at idle and found no change when spraying, and this would likely have turned up an issue with the seals, but I'm still curious to know if he also replaced the above mentioned seals and o-rings in the process.

If so, I wonder how much of his improvement was due to injector spray pattern and how much was to fixing air leaks. In my case I tested all six injectors into glass bottles and ended up replacing the weakest one with another used one that tested about on par with the remaining five. However, the difference in spray was not so great between the 'new' one and the rest of them, and I strongly believe that it was replacing the rock hard rubber bits on all six injectors that did the trick, not the minor improvement of one injector. I suppose we'll never know how badly smp's old injectors test out, but it sure would be nice to find out.