Is "carb" clean safe to use on a 4.6L with a plastic intake? Or is there a better product to use to clean my intake system. My car has 57200mi on it and it's never even had a tune up yet . So I figured I would clean up the fuel system/intake tract before I put some new plugs in her. I've heard Ford uses a "special" coating on the throttle plates on these older mod blocks. Any useful hints or tricks would be cool.

T.I.A Kyle

1997 Thunderbird LX Clairion HU, sub and amp In the works: true duals, headers, cobra MAF In the works: Mustang with a big block