Zc Idling Issues

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Junior Member
I swapped a ZC engine into 91 CRX SI and I've been having idle problems ever since. Somebody mentioned to me that throttle cable might need to be modified because it might be too long. I also find that my gas pedal doesn't come all the way back when released. The car idles at around 1200rpm if I pull back on the gas pedal a bit with my foot the idle drops to 800rpm. Is anybody familiar with this. I checked my throttle body which looks fine.