On a V6 it could be a coil dropping out, stator or trigger...
It's hard to tell when you are running if you are dropping a cyclinder.
Also your bottom carb may have trash in it as it is the first to get
junk in it..
Do a spark check first, then head for the fuel system.
Old fuel line will break down with the crap we have for gas now.
The liner in some fuel lines just breaks apart and clogs everything!!
Just my 2¢ worth...
