nwturboyota

hello i bought a 94 pickup with a 22re a while back and im having some very weird problems. when i first got it the truck ran fine then after a period of letting it sit the truck started running funny, like it was loosing fuel after 4 grand, didnt think much of it and let it sit for about another 3 weeks, went and started it up, ran horrible. so i changed all the basic stuff, plugs, plug wires, fuel filter, fuel pump(which helped) fuel pressure regulator, and adjusted the valves, still no luck. so i checked all the plug wires for spark, they sparked fine but when i would take them off of the 3 and 4 cylinder the engine would run the same, taken them of 1 and 2 the engine would die. i did the same with the injector wires and the same thing happened. i am sending in the injectors to have them reconditioned but what else am i missing. if this isnt it what else could it be?

p.s. the truck is running on an em-4 simple digital systems computer..