1990 Other GMC Models Failed California smog

1990 GMC

246,000 MILES • V8 • 4WD • AUTOMATIC

LINVDAN

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I just failed CA smog, my HC levels are as such
Idle- RPM- 1062, HC measures 173
2500 RPM- HC measures 400

What should I do to correct this? Truck seems to run fine.
Thanks

Aug 19, 2008 at 6:51 PM

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