2002 Chevy Silverado High speed miss

2002 CHEVROLET SILVERADO
89,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MFINNEY24
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  • 1 POST
I have a 2002 Silverado with the 4.3 liter V6 and 89,000 miles on it and it began to have a intermintent high speed miss (65+ mph) replaced the fuel filter and it still was having the same problem. I replaced the cap, rotor and wires with summit racing Volt Max X-treme kit and E3 spark plugs and a hypertech ignition coil and the miss is still happing any suggestions would be great thank you.
Nov 16, 2009 at 8:00 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
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
Nov 16, 2009 at 8:20 AM
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