1998 Chevy Cheyenne bucks

1998 CHEVROLET CHEYENNE
233,000 MILES • 6 CYL • 2WD • MANUAL
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MLAROBARDI
  • MEMBER
  • 1 POST
My truck bucks sporadically for the first 30 minutes I drive it. It was doing the same thing last year, I replaced the spark plugs/plug wires and the problem was fixed. Could the spark plugs and/or wires go bad in a year?
Jun 9, 2010 at 12:26 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Hi mlarobardi, welcome to 2carpros and TY for the donation

Might want to check the condition of the plugs could be fouling. Also the following could also cause your problem.

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
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.
Jun 9, 2010 at 12:32 AM
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