Okay. On the 3.8 motors they have had a intake gaskt leak that involves relacing the 6 intake seals, the larger perimerter intake gasket on the plenum and the 8 sleeved bolts.
If you can check the codes, you may find codes po171-po174 that regard a lean condition. IF so spray some carb cleaner around the plenum and listen for a idle change.
A faulty TPS may also be responsible, but their is no other procudeure I am aware of for testing other than replacing the TPS with a known good part.
Codes may be a good thing to start with.
Thursday, April 24th, 2008 AT 6:57 PM