Hi, I have a 2008 Impala (police pkg) that has been giving me problems the past 2 months. Every once in a while (once a week) I will try to start it and it will bog, hesitate, run rough. Then when I drive it, it will shift hard into gear and has not much power. About 10 mins later it will be fine. I have brought it to my shop and even left it over night for them to test. The engine light has come on a couple of times. They have replaced the wires, plugs ingintion coil and air filter. The light went on today and I was able to capture the codes. Does anyone have any idea what is going on? Here is the codes from today
2008 Chevrolet Impala 3 = 3.9

I/M Monitors

Since DTCs Cleared

Misfire Monitor ok
Fuel System Mon ok
Comp Component ok
Catalyst Mon inc
Htd Catalyst n/a
Evap System Mon inc
Sec Air System n/a
A/C Refirg Mon n/a
Oxygen Sens Mon inc
Oxygen Sens Htr ok
EGR/VVT Sys Mon n/a

--------------------

This Drive Cycle

Misfire Monitor ok
Fuel System Mon ok
Comp Component ok
Catalyst Mon inc
Htd Catalyst n/a
Evap System Mon inc
Sec Air System n/a
A/C Refirg Mon n/a
Oxygen Sens Mon inc
Oxygen Sens Htr ok
EGR/VVT Sys Mon n/a

================

DTCs (Codes)

P0069 ENG

Manifold Absolute Pressure – Barometric
Pressure Correlation

HISTORY MIL

-----------------------
P0106 ENG

Manifold Absolute Pressure – Barometric
Pressure Sensor Range/Performance

CURRENT HISTORY MIL

-----------------------

P2228 ENG

Barometric Pressure Sensor Circuit Low
Voltage

HISTORY MIL

-------------------------
P0069 MOD $00

Manifold Absolute Pressure – Barometric
Pressure Correlation

CONFIRMED

-----------------------

P0106 MOD $00

Manifold Absolute Pressure – Barometric
Pressure Sensor Range/Performance

CONFIRMED

____________

P2228 MOD $00

Barometric Pressure Sensor Circuit Low
Voltage

CONFIRMED

----------------------

P0069 MOD $00

Manifold Absolute Pressure – Barometric
Pressure Correlation

PENDING

---------------------

P0106 MOD $00

Manifold Absolute Pressure – Barometric
Pressure Sensor Range/Performance

PENDING
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Total Shot in the dark on this, as I'm pretty car retarded, but I'd consider checking the MAP Sensor Hose and seeing if it's gunked up or clogged somehow.

Otherwise, I'd start pricing a MAP sensor... *shrug*