I have narrowed the mixture condition down to the fact that when it starts to miss up I can keep it running poorly by turning the mixture control down to minimum, but if I turn off the primary injectors switch the engine appears to run okay, the secondary injector switch doesn't seem to make any difference in the way it runs at 4000 rpm or idle.  The injector switches as well as the wiring harness I purchased from Bob and all wires are soldered and covered with heat shrink.  I checked the best I can with a light and mirror and everything looks okey under the panel.  It runs the same, rather in mode A or B.  On rereading the instructions I see that the coil disable can only be checked in mode B, so I haven't done that yet. 

I turned of the fuel pump and with the injector switch's off the engine continued to run until the fuel press was down to 17 pds. and quit.  I turned on the fuel pump (LP) to the Weber and it started immediatly.  This condition started at 7.2 on the hour meter.  I really now don't have any idea where to start looking for the problem.  JohnD