2006 Chevy Cobalt HESITATION WHEN PULLING OUT FROM A STOP

2006 CHEVROLET COBALT
29,000 MILES • 4 CYL • FWD • AUTOMATIC
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ABIERS
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Recently I purchased a 2006 Chevy Cobalt (lovely car)and drives well except for something that I'm not sure is even a problem. I don't drive the car a lot or on long distances but occasionally after stopping the car and pushing down on the gas peddle it acts like it doesn't want to go. It always does, however, and rides fine. The previous owner put 29,000 miles on in two years and went back to the dealer for oil changes,etc. and there was no listing of any problems. The car is certified and has 4 year warranty but I feel silly taking it back because it doesn't always happen when I pull out. Also, the car doesn't seem that good on gas too me. Any ideas or is this my imagination. Thanks.
Jan 23, 2009 at 2:37 PM
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RASMATAZ
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2006 Chevy Cobalt HESITATION WHEN PULLING OUT FROM A STOP

Engine Hesitation/lack of acceleration

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Jan 23, 2009 at 2:56 PM