Cold legs
Vacuum leak. The distribution works by vacuum, so you must have a leak somewhere.
SOURCE: monte carlo 2001 ss 3.8 V6
is the battery good if it is shorted out it will do this or if the charging system is not working
SOURCE: 2004 monte carlo sunroof won't close
THERE IS NO MAN OVERIDE, REMOVE THE DRIVE MOTROR AND THE SUNROOF WILL CLOSE.
SOURCE: 2002 monte carlo ss
The fuel filter is located in the pressure line that runs from the fuel tank to the engine,
near to the fuel tank.
Keep the engine off for few hours before replacing the filter, to get rid of some pressure in the lines.
SOURCE: mass air flow sensor bad on 2002 monte carlo ss
It's should be a simple remove and replace. Just make sure the engine is off. Also do not touch any of the filament wires on the sensor, just the plastic housing. Also after you install it drive the car for a little while (city speeds, cruising speeds and inbetween). That way the computer will be able to readjust its setting since it is a new sensor.
SOURCE: 2003 Monte Carlo SS Hesitates and Dies after running for awhile
The ck engine light should not be ignored, what sensor was shown to be bad ? Have it scanned again and replace the sensor that is bad if it still runs rough you might want to consider a tune up. Plugs, wires, fuel and air filter's and clean the throttle body with some gumout. It could also be the IAC motor Idle Air Control. Good Luck
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