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2003 Chevrolet Tahoe Engine Misfire Anomaly

Tiny
QUARKSTAR
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 198,000 MILES
In my 2003 Chevy Tahoe Z71, about 60% of the time when I first start it up or after driving it a very short distance, the engine will have a VERY rough idle. It will, during said odd idle, dip extremely in RPM, from the normal 700 to 200-300 and sometimes, if I do not drive continuously and immediately upon the RPM dropping repeatedly, the engine will just quit. It should be noted that I recently replaced the spark plugs with OEM ACDelco plugs and spark plug wires. What is going wrong with the beast and what can I do to correct it?
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Monday, January 12th, 2015 AT 12:49 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The first step would be to check for any stored trouble codes for a possible starting point.
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Monday, January 12th, 2015 AT 2:15 AM
Tiny
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  • 2 POSTS
Actually I did, about a week ago. It said that Bank 1 was running lean. Could it be as simple as a side of my engine running lean?
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Monday, January 12th, 2015 AT 2:44 AM
Tiny
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  • MECHANIC
  • 20,761 POSTS
That's a bit unusual for only one side to be lean. I would look real hard for any type of vacuum or air leak on the driver's side of the engine.
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Monday, January 12th, 2015 AT 2:52 AM

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