I have a 2007 Toyota Prius with 120000 miles. I bought it at 90k and have had no issues until I changed the sparkplugs. Now it makes a noise when I go up big hills, which there are a lot of because I have to drive through the Badlands National Park every day. I thought it could be that I didn’t make the computer relearn the idle, but i dont get how to do that on a prius. All of the Toyota guides say to turn the ignition on and off a few times and then let it idle for 20 mins. You cant do that on a prius though because the engine stops at idle. The plugs were NGK iridium pregapped. Auto Zone said they were compatible. Ideas?