My car has an issue when only on idle, it becomes very hard to turn the steering wheel. Almost like I loose power steering. This is more noticeable when its cold outside. I took it to the mechanic and he said the issue was a dirty throttle body. Cleaning it seems to have made the problem go away for about a year and a half. Now the problem has returned. Does anyone have pics of it's location and how to clean it? Should I replace it instead? Has anyone heard of this before?