I have a few sizes of Vessel Megadore JIS (Japanese Industrial Standard) screwdrivers that I really like - 900 and 980 series. They look like a phillips but are a slightly different design. Just what is needed to remove those pesky little MAF screws that round out so easily. All-in-all just great screwdrivers - good tools make working on the old T4R a joy.
Screwdrivers | Hand Tools | VESSEL TOOLS
The other tool I use a lot is a thread restorer kit to clean up rusty inside and outside threads. It is not as aggressive as a tap & die kit, removing corrosion, dirt,etc rather than base metal. This Craftsman kit is a great deal. It is made in the USA and the same kit is sold at a more expensive price under the Kastar and various tool truck brand names.
Craftsman.com
Buckaroo