Hi Fredo
Have you looked at your ignition switch as the cause of your intermittent troubles?
Easy to switch if you have some basic mechanical knowledge .It is a culprit if you are having trany issues and also stalling issues.
Good Luck
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews