1988 Chevy Suburban Hesitating

1988 CHEVROLET SUBURBAN
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SMIDGET4U
  • MEMBER
  • 1 POST
Engine Performance problem
1988 Chevy Suburban V8 Two Wheel Drive Automatic
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when i try to drive the truck hesitates so bad that it feels like it is going to die and has no power but it idles fine and it drives in reverse fine.I changed the plug wires.
Aug 18, 2008 at 2:59 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check the following

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
Aug 20, 2008 at 5:05 AM
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