1988 Dodge Ram 50 not firing on all cylinders

I have a 1988 Ram 50 with a mitsubishi 2.0l engine. It recently stopped fireing on the two center cylinders.I am getting spark to them, but they are dead. I have compression, spark and there is fuel getting to the cylinders (sparkplugs are wet and smell like gas when removed) I have inspected the head and see nothing apparent. Nothing is broken or loose and if cranked over all the valves seem to be functioning. I might add that the unit did have a slight tick to it when it was in running condition. It happened suddenly and I thought that I may have jumped a tooth on the timing belt. Not the case timing is setup just the way it should be. If I pull the #2 or #4 or both cyliner spark plug wires off, it sounds the same and runs the same, if I pull 1 or 3 off it just dies. If I remove the spark plug and hold it to ground they both give off a spark like they should. Any ideas would be great.