Engine Performance problem
1998 Buick Lesabre 6 cyl Front Wheel Drive Automatic 183000 miles
My LeSabre has 183,000 miles without any trouble. Now, as I begin to accelerate, it has begun to 'cut out'. This seems most apparent when going up hills. However, I did notice today it was idling rough at stop lights. Time for a tune up?
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