Sorry to say this but daddy cane is way off? Especially if this is a 3.8L engine. There is a tech bulletin for this condition.
DRIVEABILITY - DIAGNOSTIC TROUBLE CODES
(DTCS) P0171/P0174 STORED IN MEMORY -
VEHICLES EQUIPPED WITH 3.8L ENGINE
MALFUNCTION INDICATOR LAMP (MIL) - MIL
ILLUMINATED WITH DIAGNOSTIC TROUBLE
CODES (DTCS) P0171/P0174 STORED IN
MEMORY - VEHICLES EQUIPPED WITH 3.8L
This TSB supersedes articles 03-4-7 and 00-21-8.
Some vehicles may exhibit a check engine light on and lean Diagnostic Trouble Codes (DTC's) P0171/P0174 (system too lean bank 1 or 2) stored in memory.
Do not replace PCM (Powertrain Control Module), MAF (Mass Air Flow), or HEGOs (Heated Oxygen Sensors), as these parts are not the root cause of the lean codes conditions described. Refer to following Service Procedure for details.
These conditions may be caused by a loose fitting on the fuel pressure regulator vacuum line on the intake manifold end and/or leaking isolator bolts/port gaskets in the lower to upper intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.
If the vacuum line from the intake manifold to the fuel pressure regulator is loose at the manifold (due to oil contamination), replace the vacuum line (9E498) and install a new design LH service valve cover (6582). Another vacuum leak source is the gasket (9H486) between the upper and lower intake manifold assemblies caused by a loss of tension at the isolator bolt assemblies (9S479) due to contamination of the rubber grommets from excessive oil pullover.
1. Perform self test, if codes P0171, P0174 are the only codes stored in the PCM then continue with this article. For any other codes, follow the normal diagnostic procedures found in the PC/ED Manual.
Wednesday, August 5th, 2009 AT 11:36 PM