Steve, Because you say that half of your injectors are spraying, and the other half are not while attached to the fuel distributor, maybe you have a problem in the fuel distributor. Have you tried hooking a known spraying injector to a fuel line where another injector previously didn't spray? If the problem follows the injector, then that would indicate that you have some bad injectors. If a known good injector will not spray on a line where another injector failed, then that could indicate a bad fuel distributor. The only other explanation that I can think of is that perhaps your fuel pressure is barely high enough to open just some of your injectors. What is the most common failure mode of the control pressure regulator? I think that normally when they fail they allow too high a fuel pressure to the injectors. Is this correct? Also, you said that pressing on the air meter flap increased the fuel spray only for a short time. Y'all correct me if I'm wrong, but isn't pushing on the air meter flap supposed to increase the fuel flow for the duration that it is pressed? If this is the case, then it sounds like this is more evidence that something is amiss in the fuel distributor. Walt Tampa, FL