FWIW, this post just helped me solve my P0505 code. When I would start the car up after it had sat for 1.5 weeks, the idle was sporadic and the car stalled out if I didn't give it gas. It drove just fine once I was rolling, so the problem for me was just at idle, mostly when the engine was cold.
So, I did this cleaning, reset the code, pulled the battery (both leads) and let it sit for 10 minutes (I did this as an extra step), and voila! Problem solved.
Many thanks! __________________
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