1997 Nissan Primera JERKING

1997 NISSAN PRIMERA
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SELORM
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1997 Nissan Primera All Wheel Drive Manual

my car jerks.i have change the plugs ,perge the engine and bought almost new fun belt.
immedaitely i slowed to the second gear then my care starts to jerk,even when u speeding it jurt .cux you will feel the car is not smooth.
pls help
Sep 26, 2009 at 6:47 PM
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RASMATAZ
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Check and test the following:

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
Sep 26, 2009 at 9:23 PM