I still say this section should be deleted, as there were never 318's in 3rd gens.
That being said, check all the tubing under the hood that runs everywhere relating to the emissions system, could be you've split a hose somewhere. The code may be totally unrelated to your symptom. See if cleaning your TB helps at all.
2003 Ram 1500 QC Hemi Lonestar "Big Red" (Mods list in profile)
2006 Charger R/T "Little Red"
Sarcasm - it beats killing people