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Q: idle too high on 1994 Toyota 4Runner

car idle too high on park. There's a code 52 (knock sensor) for check engine. It has a hard time going when you press on the accelerator. We have changed the spark plugs and the wires. What's the problem and how much will it cost to repair.
can't smog 'cuz idles too high
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The knock sensor is under the intake manifold and difficult to get at. I have seen the sensor fail but the short wiring harness to the sensor gets brittle and fails definitely replace that anyway. The idle speed could be caused by a vacuum leak or any of a number of reasons. I've seen the accelerator cable get routed wrong and cause a high idle.
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