1985 f150 running issue while driving

My 85 will have the ignition timing jump around while driving it goes advanced then severe retarded all on it's own.  I have disabled the computer timing by pulling the spout I can drive it on base timing and it did well for a while like that.  But now while driving it will start misfiring randomly and loose power bad never really backfires out eather side though just misses and no power if you pull over shut it off for a minute it will usually run fine till it does it again.   I have made sure all the guts in the distributor are tight and the distributor it self it's got a newer ignition module made no difference runs like a beast when it goes and yes new plugs and wires were done first.     I have video of it doing it if some tells me how to insert I will