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1996 GMC Sierra Engine misses at high speed

Tiny
ROBKAT719
  • MEMBER
  • 1996 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
After driving 15 - 30 minutes at 65-70 MPH on the highway the engine will miss several times a minute.
You can tell the engine misses because you can feel
it cut out. I replaced the spark plugs, PCV valve,
air filter, and fuel filter but still have the same symptoms. About 5 years ago this same problem occurred and I took it to the dealer and they said it
was an electronic part causing the problem, however I cannot remember the part they replaced. Any ideas.
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Saturday, February 7th, 2009 AT 11:46 AM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Two things, did you change the plug wires? And is the service engine light on? What size in liters is the engine?
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Sunday, February 8th, 2009 AT 7:14 AM
Tiny
ROBKAT719
  • MEMBER
  • 2 POSTS
1) The Spark Plug wires have never been replaced.
2) The engine is a 5.7L engine.
3) The engine light comes on, only when the
engine gets hot. When you start the car the
next day it is off until engine is warmed up.
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Sunday, February 8th, 2009 AT 12:56 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
GM has never made 134,000 mile plugs or wires, chenge them, change Fuel filter, air filter and PCV
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Sunday, February 8th, 2009 AT 3:58 PM

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