1999 Buick Lesabre

Tiny
DSLAZENSKI
  • MEMBER
  • 1999 BUICK LESABRE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 103,200 MILES
While driving, the rpm's go up and down dramatically. And while slowing down or stopping, the engine will just stall and ill smell slight burning.
Tuesday, June 9th, 2009 AT 7:34 AM

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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Tuesday, June 9th, 2009 AT 10:15 AM

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