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A surging idle indicates a vacuum leak on the intake. You could have a leaking vacuum line (did you forget to plug something in?) or your intake gasket may not be sealing. Like Vince pointed out an hour ago, a bad Idle Air Control Valve (IACV) could also cause this. Since it was not doing it before your engine work, my guess is the IACV is fine. With the ...


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I had a similar problem with my 1998 Honda CRV. It turned out to be the idle air control valve (IACV). I cleaned it a couple of times but the symptom returned and my check engine light came on. I replaced it with a new one and it now runs fine. It should be located mid-engine, fire wall side, attached to the intake manifold, held in place with two bolts. ...



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