Before you purchase, clean the one you have, properly with the correct fluid. Don't use anything else, no carb or brake cleaner. Do it twice and let it dry out for half an hour before refitting. Clean the throttle body of carbon and gunk with carb cleaner. Best done with it off the car so that you can get to the back side properly. That side is usually dirtiest.
Don't forget all of the vac pipes I mentioned. There are a lot of them. Some go to a sort of tree below the MAF. They can crack and also pop off easily when you are pulling things about during checking.
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