does your sniper have a afr readout? if not,I would start by making sure that all the plugs are getting spark. you can do this several ways. the easiest way is with an infrared thermometer just use it on the exhaust manifold at each exhaust port while the motor is running and if one is cold it is not firing. verify cap, wire and plug on any cold cyl.
1976 Cherokee chief
1970 AMC rebel THE MACHINE
1965 mustang fastback
1972 international travelette
Yes I have a problem that’s why Iam here