1995 Chevy Truck surges and dies

I have a 95 Chevy K1500 after sitting for about 6 months, while doing front end repair, it started running rough. It surges (like its starving for fuel) and recently started dieing.(It restarts but sometimes dies again). I started with a fuel filter and alot of fuel treatment. Since have changed the plugs, wires, distributor cap and rotor bug, fuel pump, and most recently the ingition module. Dont know what to try next thinking about the injectors or distributor itself. Ive read today that I need to check the fuel pressure, and should have changed the pick up coil when I changed the module. BTW the engine light does not come on during these rough patches.