Just recently swap in this b16a 1gen to my 94'LS, why cuz I hydroLoc the B18B1. Made so many big mistake and wasted so much money, Cutting it short...The car is idling @1000 then flucuates to 2000 then back down to 1000 & 2000 etc. It does this all the time even when HOT or COLD. The check engine light DOESN'T come on, drives excellent and strong but flucuates as soon as I let off gas and put it to neutral...took it to shop etc..still not corrected, shop checked all sensors etc. they say its fine,maybe they missed something? How can I fix this? is there some sort of vaccum leak somewhere? WHERE is it? Also my car is running really RICH all the time,can this harm the engine...being too rich? how can I tune the FPR to make it less rich. More pressure or less? I have no smoke etc. coming out of tailpipes. All in all car drives great but idles like SHiet very annoying in traffic people thinks im revving all the time..any help is APPRECIATED.