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I have a 93 civic hatch and I recently put a port and polished intake mani on after finishing I hooked everything up started my car and it threw three dtc. It was the cts tps and iacv. Replaced cts and it fixed that and tps but left the iacv code.replaced the iacv three times and still idels weird. With iac hooked up it surges on cold starts and throws a check engine light. So I unhooked it doesn't surge on cold starts but still throws a code after its warmed up I turn off my car no light till I'm at a stop to long then it throws it and only at 1500 rpms it surges past 1500 its ok. I put another stock ecu in it for a bit still threw it. Anybody got any ideas?