I'm trying to hunt down a not firing on all cylinders issue. When I removed the injectors to run a mason jar/spray pattern test I found that 3 had good pattern, 2 were weak, and 1 (cylinder 5) had no spray. I replaced 1 weak and 1 good with fresh injectors and neither new injector fired. I moved them around the distributor and no matter which of the ports I attached them to, the new injectors won't fire. I also switch fuel lines to confirm the lines aren't blocked. I can tell that the port for cylinder 5 is weak, so I'm guessing distributor? My question is, if my fuel pressure is weak, would that cause the new injectors not to fire with their fresh springs? When a distributor fails, is there a general lack of pressure or is it variable by port?
Within the last year I have replaced: 9 Fuel lines, fuel pump, CPR, removed the Cat (was melted inside), and dropped and cleaned out the tank.