Thanks Doc on the pin location, after removal of the mas I ran the pumps and tried it again, and I am getting the same results(fires and dies after pressing on the horn plate) I have turned the fuel adjusting screw counter clock wise and now have a rapid plate fluctuation when it fires. I have taken the fuel distributor and top half of the air chamber, back off. I am looking for vacuum leaks but have found nothing. Any suggestions? I know some one has done this before me . thanks in advance for any input. JNT