You said..."i dont see two injectors clogging at the same time", but by saying that I wonder, have you checked your fuel pressure? Besides the ignition, it's one of the last things I can think of - except timing jumping 1 tooth. It sounds like you checked the timing well, but idk if you can see it that close unless the harmonic balancer is out of the way. One more check, you could pull the distributor and check for shaft play or see if you can see any visual signs of electronic problems, there may be a test you can perform on the module, you'll have to search for info on that. If you pull the distributor, scribe where the bolt slot ears are in relation to the mounting bolt washers before you do so that you can put it back exactly where it was. Clean up all grounds between the engine and body as well.