MIL sets after 15 to 20 minutes of driving, in town or Hwy. Customer has complained MPG down slightly, engine runs ok. Had codes 41 & 91 (O2's). Changed both O2's. Custopmer said MPG up a little, MIL still sets. We blocked EGR off, no difference. Timing set to...

FIX posted 4/17/1999

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