Upper Intake Manifold (UIM), Lower Intake Manifold (LIM). Fairly straightforward cleaning process...very cheap...but lots of time. It's on my list of things to do too.
You are doing the right thing by running more oil than the manual says.
'98 SVT
KKM / TH fix / Mobil 1 / Synth tranny cocktail / JVC LX-30 HU / 10 JL sub / Alpine V12 amp / Panther 199 wheels / Kuhmo Ecsta 215/45/17 / Bosch +4 / Ford Motorsport wires
