I believe its some sort of vent hose but not sure. Its the large hose left of the oil filler cap that goes from the front of the valve cover to the top of the throttle body. Im trying to solve my rough idle issue. That hose has a small crack on it and I want to replace it but having a hard time identifying it. If its some sort of vent that may be giving me a vacuum leak. I have one vehicle so im going to have to pay for a overpriced toyota part. No chance of pulling it off and driving to the parts store LOL. Hope this pic helps. When i take a pic from my phone the file is too large and dont know how to resize it.
https://jdmnewyork.com/product/2000-200 ... dm-1zz-fe/