i think im having an issue similar to his but i cant find the vacuum leak if there is one either :P ether doesn't help no pops or noticeable differences. i have eliminated everything emissions wise and have an s5 upper s4 lower both are rtv'd in place..and sealed all the vac hoses that i can tell so far are connected in soo my hunt begins as well car only runs and realy shitty after push start and above 3k rpm .....

 

https://www.rx7club.com/2nd-gen-archive-72/faq-idle-problems-334730/