93 s10 rough all through rpm range
 

So far I've checked everything usual. Rotar cap, rotor button, egr, injectors, vacuum lines, ran sea foam through it, injector cleaner, gas treatment, spark plugs, plug wires, converter, everything. At any point at start up, cold or hot, it will immediately drop to normal idle and it'll run fine then sputter and chug for a split second then idle fine. Process repeats itself at idle, with ac compressor on its worse. Then under acceleration you can feel it, again with ac compressor on its ten times worse. I hooked up a timing light to #1. When it idles it'll idle where its suppose to, then when it chugs it'll retard itself 2 to 6 degrees depending if ac is on or not. I am dumbfounded by this. I have checked EVERYTHING. Any more ideas?