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i have a problem with my 92 b18b. its jdm and ive replaced the map sensor, o2 sensor, injector seals and i still run like theres vaccum leak. i tried spraying brake cleaner to see if i could find a leak but found nothing. it only does it once it warms up a little bit. i need some help with this.

 
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what exactly is it doing when you say its running like a vaccum leak their is multiple things vac leaks could do

 
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the idle surges up and down from 2500 to 900 rpms. i think i might have it figured out but any advice is appreciated

 
Rep Power: 812

are you using the right throttle body? usually tps sensor problems will cause idle surge if you dont have any vacuum leak. is your pcv valve clean?

 
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well it wasn't always like this, when we first dropped in the engine it ran great until the snow came and **** started to hit the fan. i'm going to swap intakes off of my jdm engine and see if that does the trick. i'll also clean my pcv valve because it's different on the jdm b18b than the usdm. but worst case scenario is my nuts were over torqued and cracked my intake and gasket =( gunna swap intakes and do a full clean up and see if that helps.