Whats up HT i have a 92 civic si d16z6 bored .20 over forged pistons, rods, rings, blockguard , headstuds, stage 1 comp cam, 255 fuel pump, garrett turbo and 450 injectors and 3 bar map. I just had the car turbo tuned made 271 whp on 18lbs i have been working small bugs out like tailight issues and had a broken ground, but the cars iddle goes up and down a small amount at iddle and when i hit boost the car idles at 1500 and stays there. Is an iacv issue or sound more like a vacume leak id hate to start messing with this after a new tune and throw something off. Thanks for any help.

 

Take it back to where you got it tuned. Or was it tuned properly and some modification made afterwards that did this?

 

i would lean towards tune also

 

Its your tune doooooood!
You cant turbo a car and not tune it.
Start there im sure you will get your answers from a good reputable tuner.

 

Well when i picked the car up from the tuner it was fine, i didnt notice any idle problems but we tested it 1 pass down the rd and noticed it a day or 2 later. All i have messed with is tailight wiring and i reconnected 2 grounds, besides that i havnt messed with it. I think i will call back up to the tuner and see whats up.

 

Check the low-tech approach, by checking IACV, fast idle screw, and simple things like making sure there's enough coolant in the system (check overflow bottle) to get rid of erratic idle.