spread some anti-seize across the threads of the new plugs before you install them, that will stop the problem. Also, some anti-seize compounds have the color of copper (maybe confused with rust?) If the plug came out nice and easy, then it's probably not rust, but if they were tough to break loose, it could just be a little surface rust. Hope this post wasn't too late! <img src="/forums/images/graemlins/kewl.gif" alt="" />

'99 Tacoma Xtra cab V6 TRD
TRD Supercharged, URD 7th injector and 2.2" pulley, 32X11.5 BFG All-Terrains, OME 881 3-inch lift/Toytec AAL, 5100 Series Bilsteins all around, and ProComp 130 lights.
No I'm not some creepy naked guy...