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Hesitates

Tiny
MJC454
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
I have a 1999 gmc ext. Cab siera w/5.3 L, w/ 190,000ml and it runs good it dont miss fire or run rought, But when I turn the air or heat on it starts to run rough almost like its miss-firing and when I take off from a stand still it hesitates and when I turn it off it goes away and plugs are under a year old.
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Saturday, July 16th, 2011 AT 3:35 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hesitation:

Could be one of the following below -check and test:

Oxygen sensors.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Thursday, August 11th, 2011 AT 10:41 AM

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