I like Ron's analysis. One other thought I had was that maybe the thermo time switch that controls the initial cold start injector to spray is maybe turning off too fast. It gives a "burst", but then stops. I "thinK" it is supposed to spray for at least a few seconds, with the time dependent upon the temperature. I was thinking of changing out the thermo time switch with a good one to test the idea. However, a new one is about $70 so I have not.

Mike