RB25 Starts but wont run

[Harley80]

So i got a 97 stagea with rb25 and it’s having issues running it starts runs for a good 10 or so seconds than shuts down used to run horrible for a few seconds till i cleaned what i believe is the IACV now it runs healthier but still shuts down previous owner ran the fuel filter backwards before realizing than putting it the right way. Cam angle sensor was replaced aswell some things are unplugged under the dash and i have no clue where they go cause previous owner did some uhhh funny wiring theres also a random plug in the engine bay where i have no clue where it’s home is lol. Vacuum is good and spark is good even when running so i’m at a loss previous owner also ran regular and i was told it needs at least premium. I guess i’m kinda lookin for some tips on other things to check i probably left out a few things i checked. Thank you all

[PranK]

Hi and welcome to  !

I'd be taking some pics of the plugs and wiring you've found and posting them up. The guru's on here will be able to get more from those than your descriptions of them.