Q: Truck has a lot of vibration when in park idling, on 2007 Nissan Frontier

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changed air filter, still doing it dont know but could it be a vaccum leak, only notice when parked and it comes and goes not steady
(1) Answer
Could be a vacuum leak. Raise the hood and listen for a sucking or hissing type noise. If you here this try to track it. You may find the leak. You can also use carb cleaner. If it is running rough and you hear it but cant quite locate it spray the cleaner. If it is a leak then it should start running smooth for a few second when you spray. The cleaner is combustible. It will displace some of the air being sucked incausing it to run smooth again.