i have a 91da i recently just did a 5spd conversion. the iacv had a vacuum hose that ran to diaphragm on automatic trans, i blocked it off for the time being and car ran great untill about two weeks ago the idle began to surge up and down. i then cleaned out the fast idle thermal control valve the idle was clean but at 2500-2000rpms, i tried adjusting it a few times no luck so i replaced it no luck. there has to be a vacuum leak somewhere. can anyone show me where i can T off the iacv or a good vacuum diagram?

 

does anyone have clue is to how i should deal with this situation

 

spray carb cleaner around to find vac leak. close the fitv too. screw the cap all the way in