Mechanics

HESITATING TO PICK SPEED

1996 Pontiac Bonneville

1996 Pontiac Bonneville 6 cyl Two Wheel Drive Automatic 190000 miles

when I start my car it cuts back off then I start and it hesitates for about 3 minutes t pick up speed when I'm driving. Also when I'm driving on expressway it shakes before picking up speed
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Ronniecroom
October 30, 2009.




Oxygen sensor
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

Tiny
Rasmataz
Oct 30, 2009.


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