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1998 Chevy Silverado Check Engine Light

Tiny
CROUSECO
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 81,000 MILES
I recently purchased a 1998 Chevy Silverado. It has been running great, except yesterday it started missing out (just a little), idling lower than normal (around 500 RPM), surging while driving and now the service engine soon light has come on. I popped the gas cap off, put it back on and the light went off. The light has since come back on & I am left wondering what is going on! The previous owner filled it with cheaper gas (85 grade) for the first time the day I bought it and I am wondering if that could have something to do with it. And ideas or suggestions?
Thanks for your help!
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Tuesday, December 4th, 2007 AT 4:36 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When was the last major tune-up?

Could be multiple problems-for the idle and surging check the idle air control valve and throttle position sensor.

Gas cap-have the Evap system check
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Tuesday, December 4th, 2007 AT 4:50 PM

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