• Tiny
  • calvin dee
  • 1991 Chevrolet Caprice

Engine Performance problem
1991 Chevy Caprice V8 Two Wheel Drive Automatic 178000 miles

car is stalling and hesitates even after changing fuelpump

Thursday, June 11th, 2009 AT 5:45 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

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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Thursday, June 11th, 2009 AT 5:49 PM

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