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High Idle help needed.

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I have high idle on my '96 gmc yukon: cLEARED CODES AND IMMEDIATELY GET p0306, (MISFIRE CYL 6). Also getting P0507, (IAC revs/min higher than expected. Occasionally getting P0155, (Ox. Sensor HTR Bank 2 sensor 1) I have replace PCV valve. IAC valve and all spark plugs. Spark wires seem ok. Cleaned Throttle body. No decernible vacuum leaks. Any ideas

Vehicle: 1996, GMC Yukon, 5.7 Vortech

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