Rb20det ignition timing issues!

[Drift24tsx]

Ok so.. I have a silver top rb20det in a 93 s13. My issue is timing is all over the place. I will set it at 15 snap throttle a few times raises then sits right back at 15. How it's supposed to.. however if I snap it just a little and real quick will sit at 5 can run at idle for 20 mins never moves. Give it a full rev and let go sits at 15. Snap it real quick again 5 snap again real quick 15.. again snap it 0.. then back to 15.. idle is good tps sits at .45 whether it's 15 30 0 5 etc..Electric fans come on drops to like .43 snap it back at 15.. soo... issue is something is changing timing and can't figure it out.. also if it's at 15 and I tighten the bottom and top left bolt on cas timing stays at 15 go to tighten top right jumps to 30.. so.. I leave the top right bolt loose and stays at 15 till you give little snaps of throttle thenot jumps around. Please help!! So much research I have done and can't find anyone that has timing jumping like that. Ty in advance!!