I was able to upgrade with the clip type sensor mount in 2002 and up model housings including the sensors for less then $100 from RockAuto.com A class place to buy aftermarket parts.
The process I used was slow and not very effective. I purchased a package of three small wire brushes in the paint department of Wal-Mart. I had a can of aerosol throttle body cleaner that I used as a solvent. The brushes were not stiff enough and the throttle body cleaner was not strong enough to rapidly separate the carbon buildup from the plastic surfaces of the manifolds so at times I used a small flat screwdriver with worn edges so it wouldn't gouge the plastic. There must be a better method.
I ordered Ford part number YL-2Z-9E473-AA from Forddirectonline.com for $49.49 plus shipping (also available from FordPartsCenter.net and MidTennfordparts.com for about the same price).
I'm getting codes P0174 & P0171 so i'm due for inatke gakets. Will the kit works om my 2000 Explorer SOHC? I can't find the kit that cheap, the chepest i found is $70.I just ordered that part # from MidTennfordparts.com for about $54 minus shipping. That's still the most current kit?
My doggone Ex clicked off some Lean codes this AM and is doing the cold start sputter, high rev, sputter...
I have no idea if this kit was done before I took ownership 4 years ago.