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I relocated the knock sensor and cleared the codes then drove for about 50 miles. Engine light came on and I discovered a code for the Idle Air Control Valve. I removed the plenum and noticed that the guy who changed the valve cover gaskets did not connect the harness for the valve. I reconnected and reassembled engine. Cleared the codes and drove for another 40 miles, service engine light back on. Codes again are P0325 P0300 P0174. Are all of these as a result from the P0300 code?

If so, the misfire code has a great deal of possible reasons for the malfunction. Could this be a result of my removing the plenum and intake air duct?

What troubleshooting procedure should I begin with and follow to correct the issue?

Any help would be appreciated....

Vehicle: 2000 Nissan Pathfinder, 3.3

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The knock sensor code (p0325) will come on with other codes, so fix the other codes first.

P0300 and P0174 togther might be an intake leak, I would recheck everything if there is an intake leak near the gasket you will need to get a new intake gasket

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