i have a 98 acura integra ls running stock block and stock b16 head, with gsr cams b16 pro products manifold, hondata gasket, ls throttle body 22 tooth pump and belt , also running graddy 18g turbo witch we welded the flapper shut and am now running tial 38mm external waste. trying to figure out why i can not get her to idle right when u first start her up she stays at 3 grand and about 40 seconds later she starts fluxuating between 1500 and 3 grand and just keeps doing it ive check vacumm,oil pressure & fuel pressure no problems just can't get it up for all sugestions. this is my daily driver and really cant afford the down time

 

check map sensor you might have to replace it alchec to make sure you didn't switch the map and tps plugs...did that once and was pissed when i figured out it was something stupid

 

no vaccum leaks i would ckeck the iac valve very sensitive to any kind of wear and tear or damage!