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1998 Pontiac Grand Am jerks and misses

Tiny
MONTEGIRL23
  • MEMBER
  • 1998 PONTIAC GRAND AM
Engine Performance problem
1998 Pontiac Grand Am 131000 miles

When driving, car all of a sudden jerks, sometimes when I acc. And sometimes with I take my foot off the gas, its scary and sometimes I think I can lose control of the car, what causes the car to jerk like that?
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Sunday, June 28th, 2009 AT 6:57 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
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Sunday, June 28th, 2009 AT 7:00 PM

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