Gas petcock open for starters...??
After that I'd probably consider dumping the current gas and getting new(small investment). Then check spark plugs to determine if wet/dry one or the other. Could be fuel or ignition. Check coil wires. Check that no critters made a nest in the AC and choking the air supply.
Could be something simple or could be a bear to track down. Buddy had a Raider that he was pretty sure got bought at wholesale and then powerwashed to look good. had electrical and other problems for a long time and he is a mechanic!!