1996 GMC Sierra Engine misses at high speed

1996 GMC SIERRA
134,000 MILES • V8 • 4WD • AUTOMATIC
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ROBKAT719
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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.
Feb 7, 2009 at 11:46 AM
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MERLIN2021
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Two things, did you change the plug wires? and is the service engine light on? What size in liters is the engine?
Feb 8, 2009 at 7:14 AM
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ROBKAT719
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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.
Feb 8, 2009 at 12:56 PM
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MERLIN2021
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GM has never made 134,000 mile plugs or wires, chenge them, change Fuel filter, air filter and PCV
Feb 8, 2009 at 3:58 PM