2003 Silverado V6, miss above 3000rpm

Tiny
AYLEEUSS
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 71,000 MILES
2003 silverado v6 71k miles. I just bought. Seems to run fine under normal driving conditions. Once I get to 3000 rpm, I hear what sounds like a spark knock then the engine will start to cut out rapidly and the truck will buck real bad. If I let it miss like that it will throw code p0335 (knock sensor) but this code can be caused by many other things.
The distributor was replaced recently. So far I have checked that the distributor rotor was pointing at the alignment mark at tdc, Did not replace cap or rotor, but they appeared good and to have been replaced recently. I id replace plugs (ac delco iridium) and wires.
It seems to be a ignition problem. Have not checked fuel pressure.
It also has issues with the gauge cluster, which I am replacing tomorrow. The tach jumps real high when the engine is cutting out. Dont know if it could be related.

Any ideas?
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Friday, May 6th, 2011 AT 4:54 AM

1 Reply

Tiny
RASMATAZ
  • EXPERT
Do you have a check engine light and when was last tune-up?

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock 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 it and keep testin
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Friday, May 6th, 2011 AT 5:17 AM

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